Difference between revisions of "Potassium ferrocyanide"

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| ImageCaption1 = K4[Fe(CN)6]•3H2O crystals, grown by following ChemPlayer's method of converting K3[Fe(CN)6] to the ferrocyanide salt
| ImageCaption1 = K4[Fe(CN)6]•3H2O crystals, grown by following ChemPlayer's method of converting *[http://www.sciencemadness.org/smwiki/index.php/Potassium_ferricyanide K3[Fe(CN)6]] to the ferrocyanide salt
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Revision as of 23:07, 13 May 2018

Not to be confused with potassium ferricyanide.
Potassium ferrocyanide
Potassium ferrocyanide aka potassium hexacyanidoferrate(II).jpg
Potassium ferrocyanide sample
IMG 0617.JPG
K4[Fe(CN)6]•3H2O crystals, grown by following ChemPlayer's method of converting *K3[Fe(CN)6] to the ferrocyanide salt
IUPAC name
Potassium hexacyanidoferrate(II)
Other names
Ferrate hexacyano tetrapotassium trihydrate
Potassium hexacyanoferrate (II) trihydrate
Tetrapotassium ferrocyanide trihydrate
Yellow prussiate of potash
Molar mass 368.35 g/mol (anhydrous)
422.388 g/mol (trihydrate)
Appearance Light yellow solid
Density 1.85 g/cm3 (trihydrate)
Melting point 70 °C (158 °F; 343 K) (decomposes)
Boiling point Decomposes
28.9 g/100 ml (20 °C)
Solubility Insoluble in diethyl ether, ethanol, toluene
Safety data sheet Sigma-Aldrich
Flash point Non-flammable
Lethal dose or concentration (LD, LC):
6400 mg/kg (oral, rat)
Related compounds
Related compounds
Prussian blue
Potassium ferricyanide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Potassium ferrocyanide or potassium hexacyanidoferrate(II) is is the potassium salt of the ferrocyanide coordination complex. It's generally available as trihydrate, K4[Fe(CN)6]·3 H2O.



Pyrolysis of potassium ferrocyanide will yield potassium cyanide:

K4[Fe(CN)6] → 4 KCN + FeC2 + N2


Potassium ferrocyanide is a lemon yellow solid, soluble in water, but less so in organic solvents.


Potassium ferrocyanide can be purchased online.


Can be prepared by heating a nitrogen source, such as potassium nitrate, with iron and carbon.




Potassium ferrocyanide is irritant and should he handled with care.

While it contains cyanide groups, potassium ferrocyanide cannot be broken down to hydrogen cyanide in the organism, making it nontoxic.


In closed bottles, away from strong acidic vapors.


No special disposal is required. Can be dumped in trash.


Relevant Sciencemadness threads