Potassium ferricyanide
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Not to be confused with potassium ferrocyanide.
"Prussian red" redirects here. For pigment based on ferric oxide, see Venetian red.
Potassium ferricyanide is the chemical compound with the formula K3[Fe(CN)6]. This bright red salt contains the octahedrally coordinated [Fe(CN)6]3− ion.[2] It is soluble in water and its solution shows some green-yellow fluorescence. It was discovered in 1822 by Leopold Gmelin.[3][4]
Quick Facts Names, Identifiers ...
Names | |
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IUPAC name
Potassium hexacyanoferrate(III) | |
Other names
Red prussiate of Potash, Prussian red, Potassium ferricyanide | |
Identifiers | |
3D model (JSmol) |
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ChEBI | |
ChemSpider |
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ECHA InfoCard | 100.033.916 |
EC Number |
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21683 | |
PubChem CID |
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RTECS number |
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UNII | |
CompTox Dashboard (EPA) |
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Properties | |
K3[Fe(CN)6] | |
Molar mass | 329.24 g/mol |
Appearance | deep red crystals, sometimes small pellets, orange to dark red powder |
Density | 1.89 g/cm3, solid |
Melting point | 300 °C (572 °F; 573 K) |
Boiling point | decomposes |
330 g/L ("cold water") 464 g/L (20 °C) 775 g/L ("hot water")[1] | |
Solubility | slightly soluble in alcohol soluble in acid soluble in water |
+2290.0·10−6 cm3/mol | |
Structure | |
monoclinic | |
octahedral at Fe | |
Hazards | |
GHS labelling: | |
Warning | |
H302, H315, H319, H332, H335 | |
P261, P264, P270, P271, P280, P301+P312, P302+P352, P304+P312, P304+P340, P305+P351+P338, P312, P321, P330, P332+P313, P337+P313, P362, P403+P233, P405, P501 | |
NFPA 704 (fire diamond) | |
Flash point | Non-flammable |
Lethal dose or concentration (LD, LC): | |
LD50 (median dose) |
2970 mg/kg (mouse, oral) |
Safety data sheet (SDS) | MSDS |
Related compounds | |
Other anions |
Potassium ferrocyanide |
Other cations |
Prussian blue |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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