Arsenic - Periodic Table of Videos

[@ryanpenrod1859]

"He always claimed he was innocent, but when he was arrested he had a packet of arsenic in his pocket." Smooth.

[@80cardcolumn]

He claimed "That's not mine."

[@alphonsokurukuchu]

someone is framing me!

[@Lightning_Lance]

That seems a bit too lucky a find. He could well have been framed.

[@GRBtutorials]

80cardcolumn And after they accused him of lying, he claimed: “I meant that it wasn’t mined, you just misunderstood... it was made through reaction of arsenic with nitric acid”.

[@billsinkins361]

"These aren't my trousers, copper!"

[@The12hugo]

“It tastes like sugar” I’m very sorry for the first man who discovered this lol

[@Xirpzy]

"I must say, your wallpaper tastes really sweet."

[@shelbysteiner]

@@Xirpzy The schnozzberries taste like schnozzberries!

[@choosefreedom4725]

How did that go down? "It tastes like sug..." dies*

[@tommytallgren620]

I feel sorry about the second man, he who did not belive the first man.

[@raymondhoyland61]

@@Xirpzy me

[@andrewchapman2039]

"I have two favourite stories about poisoning." I have no doubt that this man would be everyone's favourite chemistry teacher.

[@mamupelu565]

I could hear his stories all day

[@strawbrryfld1]

Andrew Chapman Definitely !

[@adamabele785]

I had in a way a very similar chemistry teacher. He could tell endless stories about countless encounters with different substances, about guys that got mercure poisoning or explosions and things that went wrong. But for sure we learned more about the nature and dangers of substances from his stories than from any of the books. One of his favorite sayings was: I´ts chemistry when it bangs and stinks. He was a scientist as well and had a degree.

[@pd6556]

I just love chemistry. And this man is helping me in so many ways. He's my online chemistry teacher,I mean this channel.😁

[@ThatBigBlackClock]

I have him for my "topics of inorganic chemistry" module and have to say he is very oldschool and doesnt believe in powerpoints, but leads very entertaining and interesting lectures haha

[@FluppiLP]

"I got bored and went out" - always the scientist :D

[@mattlogue1300]

Yep

[@the_birthday_skeleton]

I cracked up so hard when he said that

[@Masden-]

@@mattlogue1300 nice job adding nothing to say

[@andrewbreding593]

6:46 : "I was really excited 😆 I was allowed to chop up the zinc! 🥳" What a treasure

[@nodical802]

@@Masden- nice job being a douche for no apparent reason

[@Pablovru]

"It was really exciting, I was allowed to chop out the Zinc" Oh that was heartwarming ❤️

[@incorrectstuffthingy5647]

Protect this man at all cost.

[@jeffersonborges9340]

This part of the video actually broke my heart... The master really loved what he had done for his entire life... I wished I could hug him when I heard it

[@fingmoron]

Very adorable considering all the interesting experiments he's done he still loves the little things.

[@kittehme3071]

I went back to watch that part 3 times

[@heartz4dani800]

@@kittehme3071 time stamp?

[@KdetJim]

14:32 “everything else was distributed around the lab” Probably the most low-key way to describe an explosion. 😂 “You blew up the lab!!” “No. I just distributed the apparatus around the lab”

[@sakkek5349]

Cos why make it such a big number, cos its already happened. And shouting about it , wont change a thing..😊. Short of clever way to make things straight.

[@TheSonicWafflez]

Sounds like a line from a Douglas Adams book. "The experiment decided to suddenly and violently distribute itself around the lab" XD

[@dmka12]

Elon Musk would refer to it as a RUD - Rapid Unscheduled Disassembly

[@VintageTechFan]

"I moved our experiment into the Cloud."

[@mattlogue1300]

What happened to chemist? Was he likewise finely distributed amongst the lab?

[@Jackismycopilot]

"People used it to get rid of their lovers, their wives, or just AWKWARD PEOPLE." hahahahaha

[@dizzze]

I prefer "i've got 2 stories about poisoning, BOTH OF THEM ARE TRUE"

[@tayet6875]

JackIsMyCopilot *laughs awkwardly * Oh no!

[@whateverppl1229]

"you seem awkward, would you like some sugar?"

[@williamsquires3070]

dizzzer adventure - it’s probably to the benefit of “awkward people” that forensic science has caught up, or there’d be a lot fewer of us!

[@otakuribo]

**feels personally threatened*

[@vezzosetto]

lead acetate paper used to be used to remove traces of H2S when quantifying arsine evolved in the Marsh test with mercuric chloride. Mercuric chloride is specific for arsine as long as there's no H2S present along with it. It's part of the arsenic detection kit but it doesn't detect arsenic itself!

[@MM-wi4dt]

Such a lovely bunch of chemicals

[@NinoNiemanThe1st]

Thanks desange, great explanation. A shame so many of these chemicals are so toxic...still can't go up against a Marsh Test when it comes to illicit (or licit) consumpton of chemicals like As, and the colors you often get after the reaction are endlessly fascinating.

[@mikeharris1002]

That kind of ties up with my memory of using mercuric chloride papers in a quantitative test in about 1968. Some dilute sulphuric acid and and a few zinc turnings were added to a solution of the material under test and the gas that was evolved passed over a mercuric chloride paper test strip. The test strip picked up a brown stain from the gas with an intensity that was related to the concentration of arsenic in the solution under test. This was determined by comparing the stain with an incremental set of standard stains prepared under the same conditions.

[@markusfaller1333]

The test with mercuric chloride is called Gutzeit test and for that test you should fist trap hydrogen sulphide H2S out of the gas stream which contains the arsine AsH3. Normally you use a cotton ball dipped into lead acetate but it seams that you can use the lead paper instead. Nice to see how ancient chemist alleady knew so much about the chemical reactions.

[@speedslayerr]

Fascinating stuff!!!

[@beekeeperhoneymoon8179]

"People used it to get rid of awkward people" Me: *looks around nervously*

[@treyquattro]

check the color of your wallpaper...

[@hmnsdnssx]

*looks around awkwardly*

[@dr.velious5411]

I hear they're using bleach for that these days.

[@dacreator1226]

(Chuckles) I'm in danger

[@charliebrown1134]

👀

[@kanata_harumi]

"We didn't have a sample of this so we decided to have Neil made some for us." Neil as always doing the hard work. Kudos to him. also, talk about making poison...

[@nevim007]

Neil looks like he eats arsenic for breakfast

[@estelja]

Neil is not someone you would want to leave alone in your garage.

[@abdullahkilinc473]

"Neil`s Brown Sludge" name of my rock band

[@inhumanfilth681]

Sounds more like punk lol

[@feyk9638]

Sounds like he's been a bit sick lately

[@es8559]

Dia Rhea Rama

[@kylebaker1220]

My NickName in Highschool.

[@mhyotyni]

Sounds like a hillbilly moonshine to me 🍸

[@logicplague]

"We were really hopeful we were going to get our white powder" You and me both, man.

[@linkin543210]

😏 I know what you saying fams

[@Guna89420]

I feel the feels

[@spacebarbarian._]

tf

[@MongooseTacticool]

Had to settle for some sticky black.

[@jackoliver7506]

@@MongooseTacticool looked like black tar "something"

[@madLphnt]

"Sweet maker named John Neil, sent his lodger to get some daft for his next batch of sweets." Thats the most British sentence i think i have ever heard. I love it.

[@billynomates920]

perhaps he was the origin of the expression never trust a man with two first names?

[@jessserene5265]

"I was so excited I got to chop up the zinc" I love it when people can get excited for the small things. It's a hard skill to learn, but it really makes life better lol

[@ile84]

"I got bored and went out" spoken like a true chemist :D I feel that way too, the impatience.

[@ic08jy700]

This guy is the archetypal college lecturer. He loves what he does and is excited by it and wants you to be too. I love the chemistry he goes into and think all of his element videos are little masterpieces. It is conceivable that they will be preserved and go down in history as THE descriptions of their age. I hope so.

[@electronicsNmore]

One of the few channels that I watch the video all the way through. Great video!

[@periodicvideos]

Thank you!

[@electronicsNmore]

@@periodicvideos You're welcome!

[@januarioqueiroz3122]

Yes, it is!

[@Avci__]

@@periodicvideos He has a powder that contains iridium, osmium, rhodium, gold and arsenic. How do I get rid of arsenic? Can you help me?

[@zachdurocher1166]

How to start a conversation: "So my two favourite stories about poisoning..."

[@BobWidlefish]

“Liquid fluorine” yeah that sounds safe.

[@ThisIsTaco1]

I love how he uses that story to explain violent reactions of Arsenic, when all flourine knows are violent reactions

[@BobWidlefish]

*@ThisIsTaco1* just keep it under liquid nitrogen and it’s perfectly safe, what could possibly go wrong? Oh right, it could explode.

[@theblackbaron4119]

@@ThisIsTaco1 :') brilliant

[@zapfanzapfan]

An explosion of fluorine and arsenic... I wouldn't go near that lab...

[@olbluelips]

Fluorine is amazing, the only thing it won’t form compounds with are Helium and Neon! :)

[@justl2609]

Even though I changed my profession from a biochemist student of second year to lawschool, I always find myself coming back to watch the professor and the staff explain chemistry to us, you can tell they are passionate for their field. Thank you professor for taking the time to shed light into the world of chemistry for everyone!

[@MattLuceen]

“I have two favorite stories about poisoning.” 😂

[@solarsombrero227]

Of course he does!

[@theblackbaron4119]

Man keels over in the background ... Three! I have three favourite stories about poisonings.

[@robertr7923]

20 people were killed and over 200 ill. Yeah nice story bro

[@alazrabed]

This quote goes so well with you profile pic!

[@kittykattzee]

Very relatable 😂

[@mercster]

"I got bored and went out." That's why we love you.

[@UchihaFabio]

Just like when he exploded the amphitheatre

[@talkingdot]

I really love these deep dive videos on Elements Brady

[@jbezuidenhout46]

Professor after anything taking longer than 10 seconds: “ IGHT IMMA HEAD OUT “

[@inhumanfilth681]

"We were really hopefull we would get our white powder" Been there bro, been there.....

[@theblackbaron4119]

Baking is an amazing hobby, isn't it ;)

[@cuber9320]

You beat me to it. 2 hours late

[@artistanthony1007]

@@theblackbaron4119 It's basically like a fancy sugar, expensive and addicting at the same time.

[@theblackbaron4119]

@@artistanthony1007 Arsenic is forbidden sugar :) well, lead has also been used as a sugar substitute.

[@russell_szabados]

LOL!

[@dave8599]

AsH3 gas smells of garlic. It has a very low toxic threshold, if you can smell it, you need to evacuate right away. I used to work with it. We had toxic gas monitors sniffing the air where we used and stored the AsH3. The Cafeteria made garlic bread for lunch one day, the smell got into the AsH3 work areas, and we all evacuated, only to find the odor even stronger outside. 100 people in our cleanroom bunnysuits standing outside looking like fools. After that incident, the cafeteria had a very tall, cable braced smoke stack built for the baking oven exhaust, it was maybe 20 feet tall. We didnt get the garlic smell anymore.

[@tomkandy]

The reaction of Arsenic with liquid Fluorine? Blimey, that sounds like one for "Things I won't work with"

[@slidey1000]

But sodium and chlorine are both dangerous yet combine to make something edible. What could go wrong?

[@tocsa120ls]

and we have the obligatory lab equipment that was accelerated though the roof :)

[@gamingmarcus]

Back in the cold war they tested every possible compound for use in rocket fuels. One of those engines used liquid Lithium, liquid Fluorine and Hydrogen as fuel. Can you imagine that?

[@MrShadowmaster00]

@@gamingmarcus sidenote: the reaction was between the lithium and the fluorine, while the hydrogen would get added later in the combustion chamber (so it didn't really react much). Basically, the only reason the hydrogen is there is to increase performance (because a lower molar mass propellant increases the specific impulse of the engine).

[@YCbCr]

@@gamingmarcus Sounds like we've got Ignition! :) Fun read! On the note of Things I Won't Work With: Derek Lowe has got some on his blog, a bit of googling will bring it right up.

[@ioneatlas6821]

tenho Phd em psicologia clinica e 68 anos de idade. comecei a estudar quimica e descobri voces. amo de paixão e agradeço todo seu trabalho.

[@john_hunter_]

16:52 I like how they just film him looking at things and then walking away.

[@captain_code]

yup XD

[@squished1879]

you have been banned from /r/pyongyang

[@matthewsaxman1028]

He's just paying his respects to the deceased clergyman.

[@randomgooy7456]

No spoilers!

[@GewelReal]

He is doing the "press F"

[@robfelt9283]

Such wonderfulness. I am 67 and a newcomer to the Hall chemistry/periodic table/etc. etc. I share this with my granddaughter who is attending university North Carolina Chapel Hill and my other granddaughter who will be 16 and still in high school. They think I’m weird and I love it.

[@in.articulo.mortis]

You didn't mention my favourite arsenic compound, C4H4AsH, also known as Arsole.

[@yubach]

Mine is AsH3 "Arsine" just google its toxicity

[@Slippergypsy]

fitting.. anyone who would say "cah-hash" is probably an asshole

[@anothercitizen5233]

I scrolled down to the comment section because I was looking for comment like that. I knew it.

[@robertwilloughby8050]

And remember that Arsoles are only moderately aromatic....

[@edoardobracciotti9594]

To use those lead papers you have to reduce As to arsine (as you did with zinc in acid). Then the arsine gas passing through the humidified paper can reduce Pb(II) to lead metal, wich makes the paper black. I used it in our qualitative analysis lab in Pisa. Thank you for your videos I always apriciate them a lot!! :)

[@trewq398]

Hopefully they do a followup video and test the papers again.

[@jhyland87]

I love these longer versions of your videos. Thanks Brady!

[@aquamanGR]

I love this channel. And I love the dedication of these two guys, that are obviously in love with the subject. Sir Martyn and Neil, I only knew basic college chemistry, but your enthusiasm is infectious and I am so glad to have discovered this series - I have learned so much, thank you.

[@Bog2901]

"we didn't have any of this poison on hand so we decided to just make some"

[@cancel1913]

Your videos are so comforting to watch. I really enjoy the information and your demeanor.

[@ButzPunk]

"A town in the west of England" *Map zooms in on Wales* ಠ_ಠ

[@edwardvarney432]

Ben Rowe I know that made me really angry being a welsh boy myself

[@harrywood6502]

The Welsh-English border litterally goes through Hay-on-Wye so it's not awaful to say it's West England, some of it is.

[@slandgsmith]

Ben Rowe A town in the East of Wales

[@trickyricky2903]

Also had to check this! The point on the map looked to be in Wales.

[@theblackbaron4119]

@@edwardvarney432 Say boy... Do you like sheep ?

[@joeywilburn8672]

These are the realest chemistry videos on YT, they show the success and failures.

[@farhanahmed2508]

1:12 "Or just awkward people." *Gasps awkwardly*

[@smaakjeks]

We've found one!!

[@psygn0sis]

Gotta love people that copy, for the hundredth time, what others have said,

[@user-ge4uk9ui8y]

rip me

[@ValentineC137]

@@psygn0sis almost like multiple people can get the same obvious idea, without having to copy eachother..

[@CJT3X]

Valentine or... without reading the previous comments

[@leokimvideo]

The death element, amazing

[@Gandoff2000]

I think this guy is so cool how he makes chemistry even more interesting. Neal doesn't say much but yeah, he's cool too! I'm a fan.

[@H34L5]

i've been subscribed for years and i have no idea what Neal's voice sounds like

[@FrozenHaxor]

Neil*

[@Gandoff2000]

@@FrozenHaxor Of course. Thank you.

[@shawnmendrek3544]

yes

[@mr.iforgot3062]

Neil is a drunkard and is barely hanging on to his job. He is court ordered to attend 2 AA meetings a week. And sustain from booze. Sustain means "do without"

[@guytelfer1353]

Another excellent video, in order to measure hydrogen: measure water level during expiramenting , if want an explanation just ask

[@scotts918]

I could listen to this man tell stories for hours.

[@MegaBoilermaker]

This element was mined in Cornwall alongside Tin and Silver. If you spot an extra tall derelict mine engine house chimney in Devon/ Cornwall then it was probably an Arsenic condenser, there were also ground level condensers.

[@validefy]

Love these videos. One of The best channels on KZbin. Ill be waiting for the next one

[@mikeDeSales943]

I have been watching these videos for over 5 years now. I am so thankful for everyone who puts these together.

[@RonLauzon]

When I was in college (Michigan Technological University), I used to collect interesting mineral samples - which was easy to do in that area since it was a big mining region. I was able to pick up a small nugget of kearsargeite (copper, nickle, arsenic). It was called "kearsargeite" because it was found near Kearsarge, MI. I was told that during WWII, kearsargeite was collected for Special Forces use to make bullets.

[@uberawsome3696]

I cannot find any proof for that last point. I also looked under pumpellyite.

[@karhukivi]

Cornwall was the world's leading producer of arsenic in the 19th century. Seems hard to believe nowadays but it was widely used for colouring, insecticides and wood preserver, the latter is still in use.

[@verdatum]

I need so many more updated elements videos. Thank you for continuing to update this series!

[@PatrickBateman191]

This man is really interesting to watch. I never get tired of his videos.

[@Marchpaneforce]

Biology student from Cologne here. Never thought, I'd see a video of the professor in front of Albertus Magnus! Really wish, I had known about your visit, so I could have listened to the lecture in person. Thank you for the great video! :D

[@MegaBoilermaker]

Arsenic was mined down here in West Devon and Cornwall. A few of the old Mine engine house chimneys were adapted as Arsenic condensers and there were also some ground level labyrinthine condensers. My elder brother was once contaminated with low level Arsenic intak and did not notice until his hair was showing a greenish tint under UV light.

[@ThisIsTaco1]

14:35 "Arsenic (...) can react very violently" Well, I mean, almost anything reacts violently with *liquid flourine*

[@zapfanzapfan]

Arsenic and liquid fluorine, sounds like a mad experiment to get a new more potent rocket fuel...

[@fandyus4125]

Cesium and liquid fluorine when?

[@harryw.174]

@@fandyus4125 sounds like something a super villain would use

[@ElementalAer]

@@fandyus4125 with this thing, you are just signing a letter to death

[@DoiInthanon1897]

I was really interested by this video on Arsenic and the stories behind its use in poison. Thanks Periodic Videos! You guys are still going after 12 years doing the subject you love, really impressive!

[@hydrusje]

"I was really excited I was allowed to cut up the zink" :D I know what to send the professor now for next christmas :p

[@fish4225]

I like to think the professor isn't allowed near sharp objects.

[@wernerhiemer406]

@@fish4225 I think they fear snippets to jump up and tangle into his hairstyle. Who then is supposed to get into that holly grail to sepperate that? Because it is not solid, not liquid, no magnetic particles involved. Burning down is no option. So you would have to wait until some of those strands pertisipitate off that fluffy structure holding supstrate (scalp) and then it makes ping sound by falling onto a hard surface as detector.

[@CrazyNerdInventor]

Zinc*

[@thedanyesful]

"Zinc is by far the best element."

[@dsandoval9396]

Lol! Yeah, that was funny but admittedly a little sad as well.

[@ferdisb4070]

"And then you add the thing you think contains Arsenic, in our case Arsenic" :D

[@sureshbala1000]

No. "Neil's black sludge"

[@charliebrown1134]

Suresh Kumar Ramani “arsenic tar”

[@miltankusedrollout5472]

@@sureshbala1000 Neil's brown sludge

[@sweetwillow028_]

I got introduced to this channel by my chemistry professor 👩‍🏫 and I’m hooked now. I do see the chemistry in daily life or probably in everything this universe, such amazing thing.

[@TheCampnFool]

In college I took a chemistry class out of sheer curiosity. I absolutely despised that class. Next semester I took Intro to Computer Science and found my path, However, I find your videos quite fascinating. I wish my old Chemistry Professor had possessed your enthusiasm for the science. Now, here I am at 60 years old reading an old Introduction to Chemistry text book. Now see what you've done!? Lol Teaching old dogs new tricks.

[@jhyland87]

at 6:32, in the last sentence on that page shown in the book, it says: *Charge the... funnel B with quite dilute sulphuric acid, **_I•oN_** or less...* What is the _I•oN_ supposed to represent? Is that a

[@riverbender9898]

Though I'm even a bit older than you Professor, your videos always take me back to my early love of science, particularly Chemistry. Thank you.

[@hrtlsbstrd]

I love that his idea of a fun video is him silently paying respects at a bishop’s remains

[@johnsmith-sp6yl]

been watching these videos intermittently since i was about 6 years old, now i'm studying chem in uni. this is what got me interested in chemistry; a bunch of good, clean fun with deadly poison. the videos on the alkali metals were very intriguing, too.

[@BloodySeaGullsRoss]

6:46 “I was really excited, I was allowed to chop up the zinc” I found that quite humorous

[@jeremyalbert3969]

I love this man. His voice is so calming and he educates me so much. His stories are interesting it shows he has a great past.

[@DeadAlcoholZombie]

What. A. Gem this man is.

[@ReenosLP]

16:47 I was there and listened to your lecture. That was one of the best days I had in University so far!

[@sspinsider1482]

A fan from India sir lots of love you are amazing sir great respect from the bottom of my heart, at such a age still you are working to spread knowledge

[@Yora21]

"an Australian chemist called Bruce" Of course.

[@MrIggybo]

Yora I'd have expected somebody called Gary

[@slidey1000]

He's also in charge of the sheep dip

[@epincion]

Yes that along with 'Sheila's Green' which is what I thought he said before I saw the correct spelling.

[@ianturpin9180]

I used to know a Bruce in Sydney many years ago who supplied squidgy resin so I suppose you could call him a chemist.

[@vhaarr]

Michael Baldwin, Bruce. Michael Baldwin, Bruce. Michael Baldwin, Bruce.

[@lhaviland8602]

"In the west of England" Map shows that the town is clearly in Wales.

[@northcode_]

Surprisingly it's actually right on the border (according to Google maps). But most of it is indeed on the Wales side.

[@Mistakeful_Learning]

I really enjoy the history part of these videos. They are very interesting and I learn something new with each one. Thank you for making them.

[@velocirapture89]

Please discuss also the chemistry of Old Lace.

[@goranaxelsson1409]

A wonderful video! Arsenic is one of my favorite elements, maybe because I have found a 6.8 kg specimen that sits on the bottom shelf in my mineral collection. Arsenic is indeed metallic white when fresh, but turns brown to black on the surface over time. And when it sits on the mine dump a couple of years it gets a crust of white powder which makes it possible to spot it from meters away on small pebbles. A friend and I went to that mine (Storliden in Sweden) several times a year when it was active so I got somewhere around 50-100 kg of mineral specimens of arsenic. :-D Yummy!

[@airpolygon2714]

I absolutely love periodic videos! With all of the entertaining and illuminating experiments, anecdotes and explanations. I've been following you for quite some years now, and you never cease to amaze me with your content!

[@HarmonyHaven44]

you should heat the paper around 90C` then add solution (concentrated solution, less water)

[@kaanylmaz4080]

allow me to learn more of your ways esteemed sir

[@collinsfriend1]

I can see why your students remain loyal and connected to you. Great instructor and all around person.

[@jc441-i3q]

Neil is the Mike Ermentraut of Periodic Videos

[@misanthrope8803]

JPaul C lol yeah xD

[@guytelfer1353]

At 10:15, the green forming is not a solid, not exactly, not until the hydrogen is released into the air or frozen to dehydrate, just adding water to room air, the green sediment forming is now measurable in parts per million in a water test the more water it loses the higher the concentration of parts per million or trillion in water, measuring particles in water is used because they can't make a screen or filter any less than what there is, anything below 1 mesh is unmeasurable and why it reverts to being considered a solid again and measured in parts per million as the the sediment bonds with air, you can remoisturize after drying or dehydrating, you could use mesh as a measurement in water by looking at it as -1 mesh up to -1,000 mesh equal to or depending on parts per hundred or hundred thousand or million or billion ect, you can also use micron as a measurement guide like 140mesh is equal to 100 micron or 1 mesh equal to 15,000 micron anything smaller goes into the range of measuring by parts per million in water or solution either way the metals in solution using acids do not dissappear you just can't see them so anything measuring in parts per million you could also use mesh scale where you'd have minus -100 mesh would equal 50,000 micron

[@melskunk]

I was excited to see Realgar, perhaps my favourite arsenic compound, so pretty and fascinating!

[@tommunyon2874]

I got my BS in chemistry courtesy of the Navy, which meant I got commissioned at the same time I got my degree and went straight to the fleet. As is customary one doesn't get work in their area of expertise when serving on the line. These videos help fill in for labs I haven't had the opportunity to do myself.

[@marhar2]

"Neal found an old Arsenic sample from the basement stores" -- that sounds like the beginning of an Agatha Christie novel!

[@karhukivi]

The yellow mineral is orpiment As2S3, the red crystals of realgar are As4S4

[@shearerslegs]

Thanks for the video I love it when an alert pops up saying that you have a new one out

[@periodicvideos]

We love people who have alerts on for us!!! Bash that bell.

[@BattleBunny1979]

@@periodicvideos *ding*!

[@rowenhusky]

2 notes from Hach's method that might help with the lead test paper, though this is from a different testing method, one mentions lead acetate.: 1) This test paper allows the easy detection of arsine (AsH3) in the gas phase. Arsenic in solutions has to be converted into AsH3 with Zn/acid and purged from the solution. The arsine is detected directly at the boundary layer between water and air. Arsenic test paper is used for the easy determination of arsenic in grape must and wine. For the determination of arsine in compartment air the test paper is moistened with acetic anhydride. 2) Unfortunately, during the reduction of arsenic to arsine gas, sulfides are also reduced to form hydrogen sulfide (H2S). Hydrogen sulfide reacts with the mercuric bromide test paper in the same way as the arsine gas, causing an interference. Current methods for removing sulfide interference entail passing the arsine gas stream through a scrubber to remove the hydrogen sulfide. These scrubbers are usually made of cotton that has been soaked in lead acetate solution (zinc and copper have also been used but have been found to be less efficient). The sulfide reacts with the lead on the cotton to form solid lead sulfide, thereby removing it from the arsine gas stream.

[@Commandmanhardcore]

Great content! I love how the channel has evolved over the years. Keep it up!

[@gracechen2412]

Love the new version! Connecting to historical events are fantastic!

[@QuasistellarNymphomaniac]

I dont think you can blame the arsenic for the explosion when you react it with fluorine :D

[@periodicvideos]

True - I think the Fluorine was probably. the main offender.

[@dhavalbhalara1664]

Looking for same comments..

[@mamupelu565]

@@periodicvideos main offender... lol

[@skakdosmer]

@@periodicvideos What happened to the chemist? Was he “distributed round the lab” as well?

[@jamesjacocks6221]

@@skakdosmer He was distributed to a cab and driven home so the authorities wouldn't know what happened.

[@incription]

2:19 when the dealer is 5 minutes late

[@scotts918]

17:46 - Trying to decide if he should touch the high thumb, or the low thumb...

[@A-Ls1]

Scott S I was thinking about that

[@youlovemyyoutubname]

Yeah haha, all the students definitely know which thumb to touch.

[@skakdosmer]

...and it definitely would be the high thumb.

[@dylanb4539]

My eyes went to the high thumb😂

[@Majorweck]

I need to say: I love it, how much this channel improved by itself... It got more professional and still has it's little cute parts. I learn something about different things and can enjoy it. Please: Keep this work up! I don't want to miss it...

[@leegami3234]

"I was really exited! I was able to chop out the zinc!" Trembling of excitement, making dramatic cuts...

[@lukasausen]

17:40, this man will never be old, he just started hes chemistry career with the best of luck, wonder if hes going to be a famous chemist when he gets old.

[@jeffzzzz1955]

I love these videos so much They're always very interesting

[@mazirian9261]

Sir Martyn Poliakoff is such an amazing person! I love his level of study, and also his unique mannerisms (like enjoying cutting the zinc!).

[@swebigmac100]

Amazing video. Nice to see the professor in great spirit.

[@AlexanderBukh]

i second that

[@Bloodfang152]

I hated chemistry in high school but I binge watch your videos. It goes to show you that everything is interesting but how its explained to you could be the reason why you do or dont like something

[@benial870]

"We didn't have any deadly well known poison, so we made some!"

[@dantehulthen-yf3ps]

The fact that he asks us if we know anything about the papers is so heartwarming ❤

[@theprogrammer32]

"and I used to use it when teaching about Arsenic chemistry" "used to" you just did

[@scottycatman]

But he used to, too.

[@OldSchooledTV]

@@scottycatman Underrated Mitch Hedberg comment

[@bellicose4653]

He still does, but he used to, too

[@migsvensurfing6310]

Loved it. The knowledge and humor put in this video. Thanks.

[@TheGreatSteve]

I shaved my backside once and ended up with an arsenic.

[@sunwukong1754]

The Great Steve ba dum tss

[@joebaumgart1146]

Ha!