ONLY this acid can dissolve GOLD. Selenic acid

*In all reactions where "H2SeO4 conc." means selenic acid obtained after ordinary distillation with a concentration of about 85%.
Welcome to our captivating journey into the fascinating world of chemistry! In this exciting new video, we explore the incredible properties of Selenic Acid, a powerful and unique chemical compound.
Prepare to be amazed as I demonstrate the process of obtaining pure, crystalline Selenic Acid through meticulous vacuum distillation. Witness the magic of frozen seed crystals that bring this chemical to life in breathtaking forms! 😅
Watch as gold and silver dissolve in this extraordinary acid.
Hold your breath as we ignite an explosive encounter between Selenic Acid and Anhydrous Hydrazine 🤯
=============================
0:00 Selenium dioxide synthesis from selenium and oxygen.
0:49 Selinous acid synthesis.
1:46 Selenic acid synthesis.
2:18 Anhydrous selenic acid synthesis (vacuum distillation).
5:09 Crystalline selenic acid synthesis.
8:13 Dissolving of gold in selenic acid.
9:51 Dissolving of silver in selenic acid.
10:35 Molten selenic acid burns through paper.
10:50 Sulfuric acid and sugar.
11:22 Selenic acid and sugar.
13:07 Thermal effect when selenic acid is dissolved in water.
13:39 The difference between selenic acid and sulfuric acid.
18:47 Explosive reaction between molten selenic acid and phosphorus.
20:11 Selenic acid crystalls and Anhydrous Hydrazine
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[@Hydrazine1000]

I read the title of this video, and thought _"Hey, but aqua regia can dissolve gold!"_ ... and then it hit me: aqua regia is a _mixture_ of two acids, it's a compound chemical. It's not a (singular) acid. Ok, crisis averted, carry on!

[@kingnhonj954]

That's the exact thought I had also

[@menjolno]

no. aqua regia is nitrosyl chloride. It is not a acid because there is no hydrogen. It is a salt

[@davidmackenzie9701]

Aqua regia is a solution of nitrohydrochloric acid. The traditional solution is comprised of a 3:1 mixture of hydrochloric acid and nitric acid, respectively. It will oxidize over time to form toxic nitrosyl chloride, nitrogen dioxide and chlorine gases.

[@Hydrazine1000]

@@menjolno Uhmmm, there is nitrosyl chloride _present in_ aqua regia, due to a chemical balance (reversible reaction) between HCl and HNO3 on one side and H20 and NOCl on the other side of the equation. And since NOCl is gaseous, and some will outgas, it can be regarded as a decompostion product. Aqua regua is still (mostly) about 1 volume part nitric acid to 3 parts hydrochloric acid. (1:3 molar ratio to be more accurate.)

[@martyc2051]

i too was thinking aqua regia, but then realized that its a compound, and neither of the 2 acids can effectively dissolve gold on an independent basis (if im wong, i do stand to be corrected of course)

[@gefulltetaubenbrust2788]

Man selenium is such an underrated element. Just those blue flames are cool as hell, not even mentioning its awesome chemistry, just a shame most its compounds are toxic :(

[@ChemicalForce]

underrated like my channel 😂

[@chikianglim3632]

@ChemicalForce Nah that’s not true

[@thebogsofmordor7356]

​@@ChemicalForcethose of us that know, know. But yes, even after this long how you have only 150k subs blows my mind. You have the most beautiful chemistry on KZbin!

[@gefulltetaubenbrust2788]

@@ChemicalForce lol that's true

[@willgund779]

@@thebogsofmordor7356 I think most people just don't understand chemistry, and don't have the patience to appreciate it

[@skyethebi]

I really love when you show the synthesis of compounds in the video such as with nitrosyl perchlorate, PbCl4, Cl2O6, and any of the pyrophoric gases.

[@skyethebi]

It’s interesting that silane is generally created using a source of H+ and germane is created with a source of H-. Is that because it’s hard to get germanium in a negative oxidation state to begin with?

[@bedlaskybedla6361]

Nice video! You could try to dissolve elemental S, Se and Te in H2SeO4, they form the same coloured polycations like in H2SO4, but they are less stable in H2SeO4 due to its oxidizing properties (hot H2SeO4 oxidize them to IV oxidation state).

[@vornamenachname6300]

I've wanted to see the reaction with gold for years, but there was so much more cool stuff in this. Awesome video!

[@therealtime-o]

As always, a great Video. Thank you for all your effort.

[@peterdekker8545]

Now make a Piranha solution with Selenic Acid instead of Sulfuric Acid......😉😁

[@ChemicalForce]

😂 haha this idea has been in my head for a long time! I've already tried dissolving crystalline selenic acid in 60% hydrogen peroxide (the highest concentration of commercially available hydrogen peroxide) on cooling. I think I'll take on this video but first I need to finish the material on WF6.

[@Tranarpnorra]

Amazing chemistry and excellent photography as always! My only real practical contact with Selenium is a Selenium rectifier. As an automation technician/electrician I've had a few of these go bad on me. The smell they give off when burned is almost puke inducing.

[@Lucinat0r]

You should do a video with the Slow Mo Guys, would love to see some of the extremely fast reactions at super slow mo. since they can do over a million+ fps it would produce amazing shots.

[@beefgoat80]

I work for a jeweler. I love how much chemistry goes into purifying recycled gold. The metals most "gold" jewelry is alloyed with is treated like slag. But it's all about creating a gold precipitate they can melt down and turn into more jewelry. It's crazy how much gold has been recycled. Some of the gold in your wedding band just might have come from some ring that was sold to a gold buyer, and, in turn, was sold to a jewelry manufacturer. My boss buys old jewelry all of the time. We remove all of the stones and send it off to a recycler. My boss then gets a cut of the gold extracted. Most gold you wear on your finger is old gold.

[@christopherleubner6633]

I'm pretty sure that gold is the most recycled metal. Literally recycled since it was plucked from rocks before the bronze age...

[@beefgoat80]

@@christopherleubner6633exactly. if it was easy to get gold out of the ground, there wouldn't be such a large industry focused solely on recycling gold. For every person wanting to buy a gold ring, there's someone looking to sell a gold ring. It's the circle of life. Lol

[@Progamezia]

dude, im telling you, these videos are so good, exotic and just overall insane. Keep it up. Thank you Felix for making these awesome videos and cultivating a love for chemistry within many.

[@TooMuchMiddle]

Another fascinating and beautifully filmed lesson in chemistry. It is criminal that you don't have more subs.

[@ZoonCrypticon]

Very interesting! Could you next time perform experiments with telluric acid ? And if you should have enough leisure time and a good standing with the secret service, perhaps polonium hydroxide ?

[@asmrlifereal]

Amazing Video. Thank you for the closed caption and segment titles!!!

[@PhantomKING113]

One of my favourite acids of all times, if not my favourite. Until now there was... one video about it on KZbin? PMC is a good channel, but so is this, and we actually get to see its famous reaction with gold! Great video! Edit: I think very concentrated, very hot sulfuric acid can also eat at gold, though very slowly.

[@mokoufujiwara4209]

Piranha solution (sulfuric acid + hydrogen peroxide) can dissolve gold.

[@grebulocities8225]

@@mokoufujiwara4209 Sreetips tried that, but essentially no gold dissolved even when strongly heated.

[@user-wj3ww9qd6j]

wow! i haven’t any words! i’ll follow your channel. i like the way you make video and also the particular reaction you do.

[@Luna-br3jb]

The macro shots this man produced are some of the most genuinely beautiful images I’ve seen in my life

[@chikianglim3632]

Dude you are one of the best chemistry channels on this app. Only one working on such exotic reagents. Keep it up!🎉 (maybe a reaction of copper sulfate or copper selenate with different salts? e.g magnesium chloride? Maybe some metal salts have differing solubilities and color?)

[@TheBackyardChemist]

I die inside a little bit every time someone calls a website an app...

[@acetate6]

@@TheBackyardChemist Feel you

[@jimcoppa6946]

That was quite beautiful the way those sulentic acid crystals were formed good job

[@glarynth]

Amazing photography as always. It's nice to see these exotic substances up close and not die.

[@KomradZX1989]

Every video you make I always think, “wow this is the most beautiful chemistry video I’ve ever seen…” and then you make another video 😂❤ Love your work buddy! You rock!!!

[@juliofoolio2982]

Your deadpan delivery with the dramatic explosions hits me as deeply comedic. Thank you.

[@filipstone2]

Holy! That was an incredible video. Thanks for the detailed documentation of the synthesis. All of those selenium compounds are terrifyingly toxic. I'd love to see your safety set up some time. Thanks for all the hard work!

[@prapanthebachelorette6803]

Yes, safety tips please 😊

[@zachbrown1630]

i swear i could watch seed recrystallizations all day. just so beautiful

[@mark879]

Such beauty! The footage, the music, the crystals, the fly, wow! Amazing production value! I thank you for sharing and I thank the KZbin algorithm for bringing me here. Love these videos!

[@CatMowpurr]

Looks like a small wasp or ant, with the wasp waist, long antennae and 4 wings

[@mobilemarshall]

really nice footage, thanks for making these videos

[@tiagoferreira086]

Your videos are always awesome! Great content and editing skills!👍

[@user-ut9lx1zr9r]

As always an impressive video!

[@xXthadillacXx]

This footage is amazing, man. Great job

[@umbrakinesis2011]

Incredible, after quite a few somewhat tame experiments, I was quite surprised when the test tube exploded from the white phosphorus -p4 is usually violent, but I wasn't expecting such a bang from so little. Awesome chemical, and a great presentation.

[@OsmioIridio-og8cn]

Great contribution to our understanding of Selenium chemistry

[@zajimavepokusy1666]

Wow, I'm so amazed. I never even heard of selenic acid. It was also pretty cool to see the the copper selenate that looked the same as copper sulphate. I think that by mixing the copper selenate with sodium hypochlorite you might get red selenium along with copper oxide. Aldough i'm not sure. I think this was one of your best videos, keep up with the great work ! Amaizing.

[@derktewinkel]

Very nice video! I really liked the preparatory part with the distillation!

[@Marbslab]

Incredible video with all the close-ups and slow-mos.

[@drmilkweed]

this video really showcases the beauty of pure chemistry. I've done my fair share of vacuum distillations and crystallizations and this really captured the sense of awe and wonder i felt the first time I did them in organic chemistry lab. thanks for the awesome content!

[@joaquinfernandez8928]

BEAUTIFUL SHOOTAGE! 👍👍

[@Aut0mati0n]

When you hit the sodium with the second drop of the acid you could see the angular momentum for a second. Super cool.

[@sealpiercing8476]

Wow, these are great. What a cool oxidizer!

[@navidahmed1083]

Man! The production quality is through the roof!

[@Yamazaki339]

Amazing video! As usual!

[@scrotiemcboogerballs1981]

Always a great video thanks for sharing

[@tracybowling1156]

I ❤️ your videos, Feliks! Thank you!

[@mistercroc9407]

Another great piece

[@matthewcomfort7719]

thank you for your demonstrations

[@tomassanchez6010]

Excellent video!!!

[@hitoall123]

the crystalization of selenic acid, pure magic, thank you

[@terribleterrier1685]

How do you not have over 500k subs by now? Your videos are freaking great. I blame KZbin.

[@Jadamhodges]

Fantastic!!!

[@brandonowens282]

7:24 awesome shot of the crystals converging! As an amateur hydro metallurgist, it's interesting to see yet another why to dissolve gold. What do you use to precipitate the gold back out of solution?

[@yahyae3416]

Sodium metabisulfite or iron 2 chloride

[@brandonowens282]

Thanks! Do you happen to know how to drop aluminum from a chloride solution? I was messing around with some e-waste using hydrochloric acid and hydrogen peroxide, I'd like to dispose of it in a ethical manner. I used aluminum to rapidly cement copper, now I'd like to get the aluminum out, neutralize the pH and dump the solution down the drain. Got any suggestions?

[@yahyae3416]

@@brandonowens282 In fact, it is not a problem to neutralize aluminum chloride with a base and pour it into the sewer. You can even throw the precipitated aluminum oxide onto the pavement.

[@sqookylol2218]

good background music choices idk how but it just is amazing and fits what you do

[@lorenwilson8128]

HCN is technically an acid and dissolves gold. Hydrogen cyanide is used in most gold-mining operations to dissolve the gold out of the ground-up ore.

[@markfudger5267]

Used to be called Prussic acid.

[@ellisoneves]

Very impressive video! Congrats

[@anthonycabrera6318]

Awesome video like all you produce, can you use perchloric acid next and his reactions with diferrents elements🤔🤔

[@among-us-99999]

I think molybdenum and niobium are under-appreciated elements

[@davidcora2751]

Amazing!

[@pyr0duck676]

Once I finish grad school and get a nice paying job next year, I'm definitely going to become a Patreon! Thanks for your videos!

[@elmatysal4032]

Great video my bro

[@michaelseitz8938]

Amazing images 💖💖💖

[@kalebmaciver7117]

great video, I have really enjoyed the selenium chemistry you have shown so far. are you going to continue with some more selenium chemistry?

[@100-pc-notbot]

I love the sound track to this video 🙂

[@Jeff-jr4xw]

Great editing with the music!

[@user-yo1kv7jr9x]

Very impressive chemistry of selenium! It would be pretty interesting to look at complex substances and organic compounds of this element.

[@crabsaresilly8317]

You leave on 2 table lamps with 2 different kind of bulbs. You wait to see which type of bulb burns out first after a while and how long it takes for each one. Would you consider this example to be a scientific experiment ? ...

[@freyjaandersdottir3311]

always a good time when the hydrazine comes out!

[@mienfobelets4820]

Excellent camerawork

[@user-je3fx6li3w]

Most interesting experiences. Thank you. P.S. It’s a pity, on pause, the KZbin interface icons obscure the equations of chemical reactions, which I don’t always have time to read, as, for example, at minute 16:11

[@iankynaston-richards5239]

Tap on the screen again and the pause icon will go.

[@Bike36_]

Nice video! Can you record your cleanups just as NileRed does? I think it would be fun to watch some more exotic cleanups. It must be pretty challenging to clean up after using things like hydrazine and selenic acid. Also, instead of regular sugar, you should have tried using glucose because selenic acid is an oxidizing acid and glucose is a reducing sugar. I think it would have been interesting.

[@chikianglim3632]

Yesss!

[@DaftFader]

You saw the clean up in the video ... adding white phosphors and Hydrazine to the rest of the selenic acid. xD

[@Bike36_]

​@@DaftFaderYeah lol. The best way to clean stuff up is just blow it up, as we all know!

[@kenbrady119]

Fantastic footage! Selenic acid has fascinated me since I was a kid. Any chance of moving on to tellurium?

[@jimschofield8734]

Very relieved the fly turned around. What a plot twist, having a totally new character just appear like that.

[@VendettaProspecting]

AU is a fantastic element

[@fukpoeslaw3613]

​@@AuschwitzSoccerRef.Who are you and who stole your gold?

[@artsmith1347]

Beyond the interesting chemistry, the photography is very good. I find the iodine here and in other of your videos to be especially interesting because its color is unusual.

[@STFocus]

👍good job!

[@Ng.972]

It's the absolute first time i see gold forming a molecule😲

[@xfxox]

Awesome!

[@fadielwerr905]

I watched all your videos Your doing amazing job thank you. I have a question for you I’m looking for a chemical can break metal nail with your hand after 2min for applying this chemical on that nail. The street name of this chemical is caluanie muelear oxidize. Do you know anything about it ?

[@dragskcinnay3184]

I just discovered this channel. First of all, this is some seriously good shit. And second, you know what we all need? A collab with the SlowMo guys

[@frvl]

By the way, when gold is dissolved, a mixture of Au2O(SeO3)2, Au2(SeO3)2(Se2O5) and Au2(SeO3)2(SeO4) is formed.

[@abrasivepaste]

Amazing visuals! What filming equipment do you use? Whatever lens you're using is incredibly sharp

[@chir0pter]

that bee finding your selenic sugar cube and almost taking a drink, like finding an oasis in the desert but it's toxic to drink

[@accipiterignitus5123]

Man this channel is f underrated

[@user-SmashHit1234perfect]

Selenium is a chemical element with the symbol Se and atomic number 34. It is a metalloid (more rarely considered a nonmetal) with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. in 1817 by Jöns Jacob Berzelius, who noted the similarity of the new element to the previously discovered tellurium (named for the Earth).

[@BestSpatula]

Imagine that many tons of solid gold could be dissolved this way. Then we could build a vast pipeline network across the entire country to solve our gold transportation problems.

[@VinsCool]

13:00 that looks like a delicious mug cake that was just slightly overbaked, yum!

[@pkrent3461]

12:43 perfect brownie recipe 😍

[@petevenuti7355]

I'm surprised you didn't try and mix with permanganate‽ Also thinking that gold selenate could make some interesting red glass when melted in...

[@marlberg2963]

Selenic acid is not the only acid that dissolves gold. Sulphuric and Nitric acid in combination called Aqua Regia can also dissolve gold

[@DavidFMayerPhD]

What about telluric acid?

[@matze1389]

Very interesting. Whats the pH of selenic acid?

[@pressurechangerecord]

Great thank you

[@crabsaresilly8317]

You leave on 2 table lamps with 2 different kind of bulbs. You wait to see which type of bulb burns out first after a while and how long it takes for each one. Would you consider this example to be a scientific experiment ? ., ;

[@phillifighter1337]

The fact that no hydrogen is produced points to the gold being oxidized by the selenate and not the protons. Could you try to dissolve gold in sodium selenate?

[@canonicaltom]

Try contacting the slo-mo guys to see if they might be able to film some of the faster reactions at much higher framerates

[@Scou73r]

I'd love to see you collaborate with a super slow framerate channel for very fast reactions. Maybe slo-mo guys?

[@nevilleedwardsrennalls8634]

Bro, I love your page and your content. I’m interested in your ideas as I believe that if we can design an internal combustion engine driven by the exothermic reaction between NaK and Br2 will be the first step towards interstellar space travel. What do you think??

[@ChemicalForce]

buddy, calm down, we live on flat Earth, you can't break through the glass dome to reach the stars. :D

[@chasharris1976]

That was interesting

[@diablominero]

As I recall, strontium sulfate precipitates much slower than barium sulfate (like a 10-second delay between mixing strontium nitrate with sodium sulfate and seeing precipitate). Does strontium selenate also precipitate with a delay, or is it instantaneous like barium selenate and barium sulfate?

[@mnfen9792]

Sodium burning with H₂SeO₄ forms a green compound which turned white after cooling down. Is that [Se]n²⁻ salt?

[@dansheppard2965]

Seeing H2SeO4 reducing 2Cl- to Cl2 in HCl makes me want to see it dropped onto NaCl solid now, to see what would happen, as a companion to the sugar reaction!

[@196Stefan2]

Amazing stuff! Selenic acid reacts in many ways very similar to sulphuric acid, but compared to this, it is a much stronger oxydizing agent. Would dilute H2SeO4 react with magnesium under the formation of hydrogen, like H2SO4 does, instead the redox-reaction which leads to the formation of elemental selenium?

[@crabsaresilly8317]

You leave on 2 table lamps with 2 different kind of bulbs. You wait to see which type of bulb burns out first after a while and how long it takes for each one. Would you consider this example to be a scientific experiment ? ., ;

[@196Stefan2]

@@crabsaresilly8317 ??

[@argoneum]

This video is pure gold. Dissolved in selenic acid. And more 😸

[@karxpoland5958]

Is this some sort of hyperaggresive oxidizer I am to casual to know aboot ?

[@000TheMatheus000]

can you make sulfuric acid cristals the same way you made selenic acid cristals?