Chemical Reactions
Treatment of potassium ferrocyanide with nitric acid givesH2. After neutralization of this intermediate with sodium carbonate, red crystals of sodium nitroprusside can be selectively crystallized.
Upon treatment with chlorine gas, potassium ferrocyanide converts to potassium ferricyanide:
- 2 K4 + Cl2 → 2 K3 + 2 KCl
This reaction can be used to remove potassium ferrocyanide from a solution.
A famous reaction involves treatment with ferric salts to give Prussian blue. With the approximate composition KFe2(CN)6, this insoluble but deeply coloured material is the blue of blueprinting.
Potassium ferrocyanide, potassium ferricyanide, and Prussian blue account for over 97% of cyanides in the environment.
Read more about this topic: Potassium Ferrocyanide
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