Potassium ferricyanide
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| Potassium ferricyanide | |
|---|---|
| |
| General | |
| Systematic name | Potassium hexacyanoferrate(III) |
| Other names | Red prussiate Prussian red |
| Molecular formula | K3[Fe(CN)6] |
| Molar mass | 329.24 g/mol |
| Appearance | red solid |
| CAS number | [13746-66-2] |
| Properties | |
| Density and phase | 1.89 g/cm3, solid |
| Solubility in water | 46 g/100 ml (? °C) |
| Melting point | ? °C (? K) |
| Boiling point | decomp. |
| Structure | |
| Coordination geometry | octahedral |
| Crystal structure | monoclinic, |
| Hazards | |
| MSDS | External MSDS |
| Main hazards | ? |
| NFPA 704 | |
| Flash point | ? °C |
| R/S statement | R: ? S: ? |
| RTECS number | ? |
| Supplementary data page | |
| Structure and properties | n, εr, etc. |
| Thermodynamic data | Phase behaviour Solid, liquid, gas |
| Spectral data | UV, IR, NMR, MS |
| Related compounds | |
| Other anions | Potassium ferrocyanide |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) [Chemical infoboxInfobox disclaimer and references] | |
The compound has widespread use in blueprint drawing and in photography. Iron and copper toning involve the use of potassium ferricyanide. Potassium ferricyanide is used as an oxidizing agent to remove silver from negatives and positives, a process called dot etching. In color photography, potassium ferricyanide is used to reduce the size of color dots without reducing their number, as a kind of manual color correction. The compound is also used to temper iron and steel, in electroplating, dyeing wool, as a laboratory reagent, and as a mild oxidizing agent in organic chemistry. It is also used with sodium thiosulfate (hypo) to reduce the density of negative where the mixture is known as Farmer's reducer. Variants of Farmer's reducer can also be used as the intermediate step in reversal photography to dissolve the silver image produced by the first development.
Potassium ferricyanide is often used in physiology experiments as a means of increasing solution's redox potential (Eo' ~ 436 mV at pH 7). Sodium dithionite is usually used as a reducing chemical in such experiments (Eo' ~ -420 mV at pH 7).
See also
External links
- [International Chemical Safety Card 1132]
- [National Pollutant Inventory - Cyanide compounds fact sheet]
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