Potassium Ferrocyanide
Red prussiate, Prussian red, Potassium hexacyanoferrate(III)
| 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 |
Detecting free Iron : Spray the surface with a solution of potassium ferricyanide. If free iron is present, a blue color will appear. This test is extremely sensitive and often gives false positive results, that is, it gives an indication of iron being present when it really is not. The ferroxyl solution must be made fresh each day by addition with Nitric acid. The ferroxyl tests are described in ASTM A380.
The potassium and sodium ferrocyanides are also used in the purification of tin and the separation of copper from molybdenum ores. Potassium ferrocyanide is used in the production of wine and citric acid.
It can also be used in animal feed.
In the laboratory, potassium ferrocyanide is used to determine the concentration of potassium permanganate, a compound often used in titrations based on redox reactions.
Thus it is used as an identifying reagent for iron in labs.
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