K3[Fe(CN)6] on a watchglass.
| IUPAC name
| Other names
Red prussiate of potash
Tripotassium iron hexacyanide
|Molar mass||329.24 g/mol|
|Appearance||Dark red/red-orange crystals|
|Melting point||300 °C (572 °F; 573 K) (decomposes)|
|464 g/L (20 °C)|
|Solubility|| Soluble in acids|
Slightly soluble in alcohols
|Vapor pressure||~0 mmHg|
|Safety data sheet||AcrosOrganics|
| Prussian blue|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Potassium ferricyanide is an iron coordination complex with the formula K3[Fe(CN)6].
Reaction with a strong acid, such as conc. hydrochloric acid will release hydrogen cyanide:
- K3[Fe(CN)6] + 6 HCl → 6 HCN + FeCl3 + 3 KCl
Potassium ferricyanide is a deep red solid, soluble in water.
Potassium ferricyanide can be bought online.
- K4[Fe(CN)6] + ½ Cl2 → K3[Fe(CN)6] + KCl
- Classic photography
- Ferroxyl indicator solution
- Make fake blood
- Make potassium cyanide
Potassium ferricyanide has low toxicity, but solutions tend to stain.
Reaction with very strong acids may release hydrogen cyanide which is very toxic.
In closed bottles, away from strong acidic vapors.
No special disposal is required, though try not to dump large amounts at once.