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Author: Subject: Could i use potassium ferricyanide instead of ferrocyanide?
trowaway45258
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[*] posted on 29-3-2020 at 07:03
Could i use potassium ferricyanide instead of ferrocyanide?


Iam planning to make some potassium cyanide using this method- https://www.bitchute.com/video/Yf0n1vgWLJJU/ . In the video, potassium ferrocyanide is used, but i only have potassium ferricyanide, could i use that instead?
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DavidJR
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[*] posted on 29-3-2020 at 07:10


No.
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nux vomica
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[*] posted on 29-3-2020 at 17:29



Answer was there all the time

https://www.bitchute.com/video/PgYskj9uxHld/




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Loptr
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[*] posted on 29-3-2020 at 17:53


Quote: Originally posted by trowaway45258  
Iam planning to make some potassium cyanide using this method- https://www.bitchute.com/video/Yf0n1vgWLJJU/ . In the video, potassium ferrocyanide is used, but i only have potassium ferricyanide, could i use that instead?


You can reduce the ferricyanide to ferrocyanide using a number of methods. Hydrogen peroxide will do it under basic conditions.

2K3FeC6N6 + 2KOH + H2O2 = 2K4FeC6N6 + 2H2O + O2




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reactofurnace
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[*] posted on 31-3-2020 at 00:19


You can react potassium ferricyanide with a 6 mol equivalent of HCl and bubble the hydrogen cyanide into aqueous hydroxide then recrystallize. Don't recommend though since hydrogen cyanide is one of those insidious poisons that doesn't take much. If you have a lab grade fume hood with adequate safety measure you can give it a shot. Just be safe.
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woelen
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[*] posted on 31-3-2020 at 03:55


No, this does not work. Ferricyanide and ferrocyanide have their cyanide ions very tightly bound to the iron core and 6M HCl will have difficulty releasing the cyanide as HCN. Maybe you get a little HCN if you heat the solution, but even then do not expect a smooth and satisfactory reaction.
Ferricyanide also has the added disadvantage that the iron(III) is somewhat oxidizing and in practice, the yield will be even further reduced, due to internal oxidation of the ion. You'll get other decomposition products.

Another problem with your suggestion is that you should not bubble the gas through aqueous KOH. The aqueous solution of KCN is quite unstable and this solution quickly turns brown with formation of polymeric species. Better results are obtained with solutions of KOH in absolute ethanol. KCN will precipitate from such solutions if HCN is passed through them.




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nezza
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[*] posted on 31-3-2020 at 10:17


Isn't there a method for making mixed cyanides by heating ferrocyanide with sodium metal ?.



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[*] posted on 1-4-2020 at 06:29


Quote: Originally posted by nezza  
Isn't there a method for making mixed cyanides by heating ferrocyanide with sodium metal ?.


Yeah. That was the first cyanide prep that chemplayer posted to their channel.




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