dvr Potassium Ferricyanide

Technical Specifications:
Physical state and appearance Solid. (crystalline powder.)
Odor Not available
Taste Not available
Molecular Weight 329.25 g/mole
Color Red
pH (1% soln/water) Not available
Boiling Point Not available
Melting Point Decomposes
Critical Temperature Not available
Specific Gravity 1.85 (Water = 1)
Vapor Pressure Not applicable
Vapor Density Not available
Volatility Not available
Odor Threshold Not available
Water/Oil Dist. Coeff Not available
Ionicity (in Water) Not available
Dispersion Properties See solubility in water
Solubility Soluble in cold water
Stability The product is stable
Instability Temperature Not available
Conditions of Instability Heat, light, incompatible materials
Incompatibility with various substances Reactive with acids
Corrosivity Non-corrosive in presence of glass

Potassium ferricyanide is also one of two compounds present in ferroxyl indicator solution (along with phenolphthalein) which turns blue (Prussian blue) in the presence of Fe2+ ions, and which can therefore be used to detect metal oxidation that will lead to rust. It is possible to calculate the number of moles of Fe2+ ions by using a colorimeter, because of the very intense color of Prussian blue Fe4[Fe(CN)6]3.



Potassium ferricyanide has very low toxicity, its main hazard being that it is a mild irritant to the eyes and skin. However, under very strongly acidic conditions, highly toxic hydrogen cyanide gas is evolved, according to the equation:

6 H+ + [Fe(CN)6]3%u2212 %u2192 6 HCN + Fe3+[9]

The reaction with hydrochloric acid is as follows:

6 HCl + K3[Fe(CN)6] %u2192 6 HCN + FeCl3 + 3 KCl


Note: This article uses material from the