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Topic: Cyanide from Potassium ferricyanide  (Read 5015 times)

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Offline OrthoParaDirector

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Cyanide from Potassium ferricyanide
« on: December 08, 2009, 01:53:55 PM »
Hello I need to calculate the concentration cyanide out of Potassium ferricyanide.

Molar Mass CN = 26.02 g/mol
Molar mass 6 * CN = 156.10 g/mol
Molar Mass K3[Fe(CN)6] = 329.24 g/mol

For example if I want to have a 200 ppm (mg/l) CN solution is the following calculation right?

200 * 329.24/156.10 = 421.83 mg K3[Fe(CN)6]

Is this the right way to calculate this?

Thanks in advance.

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Offline Borek

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Re: Cyanide from Potassium ferricyanide
« Reply #1 on: December 08, 2009, 04:43:32 PM »
This is quite stable complex and it doesn't dissociate too far. You need Kf and pH for reasonable estimate.
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Offline OrthoParaDirector

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Re: Cyanide from Potassium ferricyanide
« Reply #2 on: December 09, 2009, 09:17:15 AM »
Assuming that the pH is low (<1), and it totally dissociates.
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Offline Borek

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Re: Cyanide from Potassium ferricyanide
« Reply #3 on: December 09, 2009, 09:43:22 AM »
With these assumptions number you have calculated seems to be correct. It has nothing to do with reality.
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Offline OrthoParaDirector

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Re: Cyanide from Potassium ferricyanide
« Reply #4 on: December 09, 2009, 10:09:21 AM »
Why has it got nothing to do with reality? I am curious how you can fully break down the Potassium ferricyanide. I think low pH and boiling would be the best.

Can you purpose a calculation about how Potassium ferricyanide will dissociate?

Thanks in advance :)
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