Make Purified Chloroplatinic Acid

Warning: This experiment uses highly corrosive chemicals and produces toxic gases. This should be performed with gloves in a fume hood. Greetings fellow nerds. In a previous video I dissolved platinum into aqua regia. In this video I’ll be processing the crude platinum solution from that reaction into purified chloroplatinic acid. First we need to concentrate the crude platinum solution. You can do this by heated evaporation or by boiling. But if you boil you should cover the beaker with an empty round bottom flask to prevent splashing out of the valuable platinum solution. Anyway, since we started with a 31.1g platinum bar, we concentrate the solution down to less than 100mL. Once it’s down turn off the heating and let it cool back down to room temperature. Okay back again. Now we add an equal volume of hydrochloric acid and gently heat the mixture while covered with an empty flask to prevent splash outs. Do not add the acid while hot or it might boil over. Any leftover nitric acid from the aqua regia will react with the hydrochloric acid to produce a combination of nitrogen dioxide, nitrosyl chloride, chlorine and nitrogen monoxide. Originally these were unwanted side reactions when dissolving platinum but we’re now taking advantage of them to destroy residual nitric acid. The brown gas forming shows nitric acid is still present. Keep boiling as long as you see it. If the mixture gets below 100 mL then turn off heating and allow to cool. Then top it up with another 100mL of concentrated hydrochloric acid. Restart the heating and keep going. When all the nitric acid is destroyed the vapor will be clear. Looks like all the residual nitric acid is destroyed. But I’m going to give it one more hydrochloric acid treatment just to make sure. Okay confirmed, the nitric acid is gone. Now once again boil it or evaporate it to concentrate it but this time we go down to 50 mL. Then turn off the heating and let it evaporate normally at room temperature. We can’t heat it dry because it decomposes into insoluble platinum chlorides. If it’s not drying at room temperature on air then you might need to use the desiccator bag I showed in a previous video. Personally I’m using a professional vacuum desiccator. Here we are with the dried chloroplatinic acid. Break it up and transfer it to vials. And here we have nice chunks of the purified chloroplatinic acid. As always, be sure to label your vials. Now chloroplatinic acid has the extremely annoying property that it’s highly hygroscopic. You can see the beaker and bits of chloroplatinic acid getting wetter and wetter as it absorbs water from the air. In between uses I recommend storing the vials in a dessicator while they are slightly open to keep the contents dry. Anyway that is purified lab grade chloroplatinic acid. This is a useful precursor to other platinum compounds I’ll be showing in later videos. Thanks for watching. Please subscribe like and comment. In this video we’re going to dissolve platinum in a combination of nitric and hydrochloric acids, better known as aqua regia. In this video we’re going to examine the chemical resistance of platinum.

85 thoughts on “Make Purified Chloroplatinic Acid



  2. Chloroplatinic acid is used as a base starting chemical for most types of non-elemental platinum chemistry, and is also the intermediate in making pure platinum.

  3. @NurdRage Can you make some blue crystal meth without revealing the steps, just how it looks, no need to name ingredients or amounts or anything.

  4. Now how do you get the platinum metal out? Do you use the same procedure as with getting gold from chloroauric acid?

  5. please upload the other compound data/synthesis, platinum group metal chemistry doesn't have enough videos/data online

  6. hi NurdRage. in a previous video you showed how to make a home made desiccator. In THIS video, you demonstrated a vacuum desiccator. Is it faster? Does it take LESS time to "dry" the samples? thank you for your kind attention.

  7. Something here just don't seem right, why would anyone wanted to buy it, if he can make it waaay more cheaply in his lab(?)

  8. +NurdRage
    Why is it necessary to eliminate the Nitric acid first at 1:45? Shouldn't we eliminate both Nitric and Hydrochloric acid?

  9. Hi NurdRage, just so you know I've been watching most of your vids for quite some time it's because I'm into Chemical reactions just like watching a magic show. Btw I'm a Geek and a gamer but not a Science nerd.

  10. Does anyone know how to make Platinum (ii) Carbonate from chloroplatinic acid? Any advice would be greatly appreciated. Have tried adding sodium bicarbonate to platinum (ii)&(iv) chloride and it just creates platinum black. & I cant find any info about it online.

  11. Thanks for the upload. I really enjoy thse videos while they have all sorts of extra info about adjacent topics.

    Have a good one!


  12. hi? thanks for video…
    one question…how long to dry in the desiccator? and change the color and volume?
    thank you!

  13. The H2PtCl6 * 6H2O in my lab is contaminated by water from the air, can I dry it in the vacuum desiccator(a vacuum oven with heat turned off in fact) while keeping the '"6H2O" in this compound ?

  14. How can i get rid of nitric acid ?

    Do you have another recommendation ?

    aqua regia = nitric asid ( 1 scale ) + HCI (10 scale )

  15. I personally enjoyed your vedio very much and you had done a great work up hear showing us such an awesome treatment
    It would be great if you could post a video of chloroplatanic acid process in the vaccum deccicator.

    And i would like to know how much time would we needs the chemical to be crystaline by using a vaccum dessicator

  16. Oh come on, I just need 500mg chloroplatinic acid for a homemade alkaline fuel cell (for the electrodes) with a homemade crosslinked alkaline PVOH membrane and both hydrogen and ethanol as fuel and you have such a biiig vial full of it, thats absolutely unfair ๐Ÿ™ I have whether the budget nor access to aqua regia to make it myself… ๐Ÿ™

  17. I was going to make a joke about replacing the water supply to Ft. Knox's vault fire suppression system with aqua regia and collecting the drainage but somehow I get the impression that the people who need to understand that its a joke would be the kind of people to fail to get that its a joke. They also wouldn't get why it wouldn't work.

  18. Hi @NurdRage, I made chloroplatinic acid in order to obtain Platinum(II)Diammine Dinitrite (DNP salt). Following the procedure on Brauer's Hanbook of Preparative Inorganic Chemistry, I precipitated hexachloroplatinic acid with KCl, washed it, then I made it react with a slight excess of sodium nitrite to obtain potassium tetranitroplatinate (K2Pt(No2)4) and precipitated it with a stoichiometric amount of NH3 (using a 20% aq solution). After washing it, it shoud be soluble in aqueos ammonia but it isn't. What do you think I miss?

    Thank you

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