I Dissolved a Gold BAR in Potassium Cyanide Solution!

[@ianbd77]

I remember learning as a kid that cyanide was used in gold plating, it's nice to see the topic covered. Great, thanks!

[@opuntia_man9791]

Thanks!

[@ChemicalForce]

🤑 Golden thank you! One attempt to dissolve a leaf of gold foil paid off! 🤑

[@matthewevans6502]

Gold po*soning can occur at very low doses when dealing with soluble gold salts. The toxicity for the gold is actually even higher than the CN component, so ingestion of gold electroplating solutions can lead to acute gold po*soning in a few hours, even with prompt and effective treatment

[@jakubpetka8663]

did KZbin censoring get so bad that one cannot say poisoning?

[@sprolyborn2554]

​​​@@jakubpetka8663Dude you have no idea how bad it really is...I hate Google so much. It did seem to let your comment through though. I've also had this happen. Where I can't say certain words in certain comments but can post them by themselves. It's weird. Like the AI is trying to factor in context.

[@VEC7ORlt]

The cyber nanny got so ridiculous that it is nigh impossible to have any kind of conversation.

[@sprolyborn2554]

@VEC7ORlt that's by design.

[@MadScientist267]

​@@sprolyborn2554That's exactly what's going on. Unfortunately it's a generic context and so it just sees "bad" 🙄

[@jimsvideos7201]

This video: eye candy KCN: definitely not candy

[@JetFuelSE]

mmm, love putting KCN in my eyes :)

[@not-pyroman]

It's candy if you're brave enough... Once

[@keiouji1629]

@@not-pyroman Lets not give anyone ideas for a next tiktok challenge. This whole video had my mitochondria on edge.

[@AwdeInho]

its really a coincidence since i saw your comment a few days ago from i think i few years/months ago saying that you planned to dissolve gold in a cyanide solution and now you do it!

[@F1Mo-z4t]

A very beautiful video and interaction that I did not find in this detail in the curricula, especially the chemical equations accompanying the reaction.... A lot of hard work and new work that is different from the previous one.... I wish you success.

[@gevinblue]

congrats on 200k subscribers! Love this channel bro, keep up your talent. 💪🔥

[@ChemicalForce]

🎉 Thank you so much :D

[@jadenephrite]

Regarding 8:55, commercially available gold electroplating solution contains gold dissolved in potassium cyanide which is known as potassium aurocyanide. If stainless steel is used as the anode, then the gold in the electroplating solution will eventually become depleted. On the other hand, if gold is used as the anode, then the gold in the electroplating solution will not become depleted.

[@manickbarry]

This blows my mind, gold bar dissolves in a liquid and it’s perfectly clear 😮science baby yeah!

[@petkotzvetkov6528]

Best content on the topic here, keep going back for years

[@F-sj7cu]

That paper thing is so cool

[@stefflus08]

Making indicator paper could be a wonderful video series!

[@untermench3502]

If you use Aluminum instead of Zinc in displacing Gold from Potassium Cyanide, some of the Gold will produce Purple Plague, an alloy of Gold and Aluminum. I discovered this by accident when trying to recover Gold from a Cyanide solution using Aluminum.

[@Godwh1sperer]

You wonderful Alchemist you. I am in awe.

[@defaultntuser0]

Congratulations with 200K subs!

[@Changed_username]

I love how he casually explains how to make cyanide and i just realized that i could repeat that

[@chikianglim3632]

I thought that at first, then realised I needed to buy the furnace😔

[@thomasgarbe8354]

don't play with cyanide! Cyanide in sub-fatal dosages is a potent carcinogenic pro-oxidant.

[@Changed_username]

@@chikianglim3632 and how about just a blowtorch?

[@chikianglim3632]

@@Changed_username might not give the correct temp tho

[@leoncarcosa5299]

it's impure KCN, so you'd be able to use the solution with reactions fine as long as you do it before it hydrolyzes. Which it will pretty rapidly and turn into fairly harmless cyanate. To get pure KCN, you'd have to distill HCN (from the crude KCN) into ethanolic KOH then dry it in a vacuum desiccator or in an inert atmosphere/no moisture oven.

[@rhagchem3650]

There are also a few things to consider: Competitive slower reactions: 1) CN- + H2O = HCN ( with O2) + OH- 2) CN- + O2 => OCN- ... (rather very slow....) I think that long bubbling and heating does not make much sense, since the cyanide is probably consumed by these reactions. In mining, this process is used for industrial extraction of microscopic gold, which makes up more than 90% of mined natural gold. If bonanza gold is obtained, it is better to process it differently, e.g. by amalgamation in the laboratory. Or even better, sell it to museums or collectors :). A certain complication in the cyanide process is also very common accompanying sulfides or tellurides (typically pyrite), in which gold can be bound...

[@B_u_L_i]

After working for some time in an ochem lab, doing more or less the same procedures over and over again, seeing this protocol was pretty exciting!

[@matheusfontes7737]

Its the best sequence of experiments i ever saw in my Life!! Amazing

[@Worker225]

Your filming equipement is super good!

[@RafaCB0987]

seeing the gold dissapear was really cool

[@SavinjaLabs]

Very nice video, as always. I didn't know you can get potassium cyanide from Potassium ferrocyanide. It seems a good pathway. And now I just can't wait for the CYANOGEN! 😁

[@alexabadi7458]

Yes, that's what I do with my Gold when I have to much of it.

[@rentacop577]

Personally, I make various flared bases with my gold.

[@scontss1]

Очень замечательно, познавательно и красиво👏

[@ugarit5]

Cant wait for the cyanogen

[@Edge51]

Thank you as always for the interesting video my friend!

[@Angrychemist666]

You're a sick man Charlie brown!😂 in a good way,!

[@AxGxP]

Подскажите, в какой литературе описывается рецепт этой индикаторной бумаги? Не встречал его ранее...

[@AxGxP]

На сколько я понимаю, это должен быть достаточно концентрированный раствор цианида, чтоб оно сработало?

[@hansweichselbaum2534]

I worked as a chemist for some time in the South African gold mining industry. Once the gold ore is crushed and milled, the gold will be very fine and dissolves within hours. There are four elements which accelerate gold cyanidation: mercury, thallium, lead and bismuth. Indeed, lead salts are added to speed up the reaction, and to neutralise the detrimental effect of sulfides. I wonder if the red coating on the gold is due to the reaction with the cyanate. Thiocyanate also dissolves gold.

[@ljubomirculibrk4097]

We used KCN for chemical polishing of new made 14K gold yewlery. Much faster than media polishing, you can even be to some extent selective in which metal is etched (silver, copper and zinc beter) leaving a thin higher carat gold alloy leyer which is then compressed and polished by thumbling. Much beter wear, shine and color than base alloy. Silver and gold in solution is much easier to recover than from mechanical polishing.

[@untermench3502]

It will also fool inexpensive XRF eqipment into thinking the item is of a higher Karat.

[@tracybowling1156]

Excellent video as usual!

[@stevestarcke]

Cyanide is a wonderful ion. It gets a bad rap because of it's toxicity, which isn't really that bad. I actually love the smell of HCN. It's a great complexing agent for many plateable metals. But plating in general has been demonized along with many other useful chemical processes. As an electrochemist having worked in the plating industry I am saddened by the political destruction of a great American business. So I jumped ship into the vacuum metalizing industry. Which has been given to China, along with so much else. Dammit!

[@chanheosican6636]

have you thought of making NaCN* 2KCN? It is a high amount of cyanide salt Sodium Cyanide-DiPotassium cyanide and see if you can dissolve gold better. I think it that Poorman Chemist made it a few times for exotic metals.

[@VEC7ORlt]

How do you protect zinc from oxidation - easy - just gold plate it!

[@jozefnovak7750]

Super! Thank you very much!

[@richardsymes1844]

The gold cyanide complex is very interesting. I’ve read that in solid form it can eat through teflon but I have not seen it demonstrated.

[@ivleontellus]

Just the best, keep it up.

[@RosannaPatruno]

Hi, i love your videos and maybe you can make one about noble gas compounds pls

[@vit.nik.4172]

I once watched a video where gold was dissolved in a mixture of potassium hexacyanoferrate 3, sodium hydroxide, and an unknown third component - presumably some kind of thiosulfate or thiocyanate. Gold can be extracted from the resulting solution using zinc dust.

[@KarimY-119]

now i need to see more reaction producing elemental iron ❤

[@yakacm]

ChemForce buy a 10g ingot of gold, Nile Red buy a machine from AliBaba that costs $83,000 that makes gold from dry ice and compressed air, lol.

[@lorez201]

Can this be done with copper as well?

[@samira.8919]

music / song at the beginning is "Dismantle" by Peter Sandberg

[@Scientificexploration]

@ 3:35 the cheese I forgot in the fridge.

[@joeylawn36111]

9:15 The equation shown does not show any gases in the reaction, yet there are Bubbles forming. The cyanate ions mentioned earlier decomposing to cyanide and oxygen?

[@LFTRnow]

Instead of sandpapering it, what happens if you polish it? Is the coating thick enough to give a normal gold shine?

[@ambirbtruckdriver]

I have no idea what’s going on but it’s cool

[@erictjones]

How did you prepare the Zinc sample prior to placing it in the 2K[Au(Cn)2}]? I am guessing that the scuff marks on the cube means that you used abrasive cloth on all sides and perhaps a quick rinse in some type of solvent? Thank you for another great video, it is no wonder that alchemists were considered magical when demonstrating their craft.

[@ChemicalForce]

I boiled that zinc in formic acid. The scratches are still there from the test reactions

[@Satori-d6y]

Isn't there a Medieval recipe for calcining fireplace ashes with leather scraps, then cool and leach out KCN?

[@nathanieljames7462]

2:24 And then I add Red Koolaid to water to make a solution of water and Red Koolaid

[@bahramamiremjad]

Hi engineer, it was very excellent and informative. Is potassium cyanide stronger than sodium cyanide?

[@stefflus08]

Do they not usually use Hydrogen peroxide instead of bubbling Oxygen?

[@YT-fk7cp]

Красивый опыт, но осторожнее с цианидами!

[@КостянтинПриходько-п5ж]

Дякую, дуже цікаве і захоплююче відео. Наступним має бути фульмінат ( або азид?) золота?

[@thomasgarbe8354]

nice chemistry!

[@chanheosican6636]

Neat Cus H2S mix for cyanide salts.

[@MCPicoli]

What? Nothing exploded or is in flames?

[@jimsvideos7201]

The music is subtle enough that you’d miss it if you weren’t paying attention 😊

[@MerchantMarineGuy]

Can barely hear it over the terrible accent. Like nails on a chalkboard.

[@WHS_reviews]

To me the music is very annoying and distracting, and so I fastforwarded through the video...

[@MrJonathandowns]

Would a little H2O2 be a useful source of oxygen instead of bubbling in gas?

[@patrickjanecke5894]

At the risk of diluting the solution, I suppose. I'm surprised he didn't go straight to liquid ozone.

[@umbrellacorp.]

Why use Acid when you can use Cyanide.😎👍💯

[@CraigPater]

Isn't it also possible to dissolve gold in a sodium cyanide solution ?

[@grebulocities8225]

Yep. Any alkali or alkaline earth cyanide will complex with gold.

[@Moritz___]

Making H2S to detect Cyanide 💀

[@KasumiModa]

The beauty surely is in the eye of the beholder. To the others, what's the point of this High School chemistry demo?

[@jupa7166]

Is this solution any good for electrochemical gold plating? I've always wanted to restore some old gold plated watch, it's on my bucket list since childhood. Any thoughts?

[@InternetFiend68]

Next video gonna be a banger😤😤

[@charleshines2142]

Also to get zinc you can use a penny that lost its plating, assuming it is not solid copper. Anyone who knows about pennies knows that they have been mostly zinc for a while. What purity of zinc it is I do not know. I would assume that it is fairly pure unless I am shown otherwise on that.

[@ZoonCrypticon]

@5:45 It is, roughly calculated and not knowing the concentration, the volume, the temperature etc., a ratio of the measured times for dissolution of the gold, as is the oxygen content in normal air 9min/25min = 0,36 = 36 % (but air has 21 % of oxygen).

[@Angrychemist666]

Im glad im not alone!

[@patrickjanecke5894]

The other gasses get in the way of any reaction, so it doesn't slow in a linear fashion.

[@rickrolls4928]

9:17 What gas is that?

[@RiehlScience]

Most likely hydrogen

[@853nova4]

9:27 why there are so many bubbles react with Zinc

[@thebestfuture-2024]

What is the background music at 9:10 to9:40?❤It’s so beautiful!!🤩😍🥰

[@CryptoFrenzyX]

He really loves H2S

[@aSCrouton]

after the penny turns black from the sulfur in carbon disulfide, do the CN ions strip away the CuS or actually convert it back to elemental Cu? In other words if this experiment were repeated multiple times would the penny eventually lose its imprinted detail?

[@gopiprakash7650]

Can any direct or combination solution dissolve the lead without a settlement layer. ????. I'm try to dissolve the lead ... Canu help me?

[@ZoonCrypticon]

By the way, how do you neutralize the KCN ? With FeSO4 ? Could you use Na2S2O3 ?

[@grebulocities8225]

You'd typically oxidize it to cyanate with e.g. H2O2 or NaOCl, but perhaps the thiosulfate might make SCN which is even less toxic than cyanate.

[@fercarcas]

how to dissolve silver in cyanide? same way? how long it takes?

[@peterteatree]

How would you drop the gold out of solution without using another metal like zinc? Could you use SO2 gas like you can with gold dissolved in aqua regia?

[@janisalnis6422]

electrolysis

[@eaglgenes101]

...I think I'll go with the oxidizing acid solution fuming with noxious gases for gold dissolution, thanks

[@johanea]

Another way to detect cyanide is to make a taste test. A tea spoon should be enough.

[@ChemicalForce]

It's not a selective method! For example azide will give the same reaction

[@grebulocities8225]

It's very bitter. Don't ask how I know that.

[@xxdarthrevanxx7217]

How did I not get this as recommendation yesterday already? youtube fix your algo asap pls

[@scarletevans4474]

If I put a tungsten in the vial, instead of zinc, would it also got covered in gold? Don't ask why, just curious 😛

[@samGold27]

Aqua regia is the best 👌🏻

[@aqdrobert]

Uncle Scrooge: WHO POURED KCN IN ME MONEY PIT?

[@ctid107]

I wouldn't like to be empying your bin every week!

[@henryD9363]

I watch almost all your videos and think they're very informative. I think sometimes you're very heroic for doing these crazy reactions! But there's one aspect that makes me very frustrated and I don't understand it. You put up the formula for about 1 second, not 3 seconds. Not 5 seconds but barely a second. What is the point of putting it up at all? You can't read it. If I want to find out what your reaction is I have to stop, go back and then hope I can pause on it. Do you think your viewers are 9 years old at all? They want to see is pretty colors and smoke. Some of us actually want information but you make it very difficult.

[@BrianCK007]

Precipitate the gold out with Sodium metabisulfite and refine it?

[@InternetFiend68]

why do you want to refine 99.99% gold🙄🙄

[@p1ai162]

What's the price of that gold?

[@wolfy3802]

What if we use concentrated H2O2 instead of oxygen?

[@SocialistSociopathPK442]

Can experiment with indian brand

[@tbird-z1r]

I have a fear that if i ever obtained some solid gold I'd be inclined to dissolve it like this, and not have the skill or ability to ever recover it.

[@dielaughing73]

He's definitely not recovering ⅒ of a gram of gold. It's worth about $8

[@lazerusmfh]

Awesome

[@thirstyCactus]

Loved the magnet trick! Too bad that only works with one element...

[@p1ai162]

9:18 what are these bubbles?0

[@ChemicalForce]

That's hydrogen. Potassium cyanide solution is alkaline and zinc reacts with it

[@dylanparra7109]

Pretty sure you can distil off the hcn

[@HaliShores]

Mix KCN with HCl

[@karskkanal5981]

AUUUUUU You did used a 24 carat Turkish gold 🇹🇷🇹🇷🇹🇷

[@Chris_Garman]

Muffled furnace sounds like a bad translation. Now I know what a muffled furnace is.

[@josemiguelmunoz6985]

I like the video but I miss at least one or two explosions. 😉

[@TooMuchMiddle]

You're going to let that zinc just take your gold like that??

[@rogermorrison2968]

Видимо, в слитке не всё золото было чистым.

[@sutraXxX]

Beautiful 1:40