[OrthoParaDirector]

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.

[Borek]

This is quite stable complex and it doesn't dissociate too far. You need Kf and pH for reasonable estimate.

[OrthoParaDirector]

Assuming that the pH is low (<1), and it totally dissociates.

[Borek]

With these assumptions number you have calculated seems to be correct. It has nothing to do with reality.

[OrthoParaDirector]

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