Potassium ferrocyanide

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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
Names
IUPAC name
Potassium hexacyanidoferrate(II)
Other names
Ferrate hexacyano tetrapotassium trihydrate
Potassium hexacyanoferrate (II) trihydrate
Tetrapotassium ferrocyanide trihydrate
Yellow prussiate of potash
Properties
K4[Fe(CN)6]
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
trihydrate
28.9 g/100 ml (20 °C)
Solubility Insoluble in diethyl ether, ethanol, toluene
Hazards
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.

Properties

Chemical

Pyrolysis of potassium ferrocyanide will yield potassium cyanide:

K4[Fe(CN)6] → 4 KCN + FeC2 + N2

Physical

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

Availability

Potassium ferrocyanide can be purchased online.

Preparation

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

Projects

Handling

Safety

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.

Storage

In closed bottles, away from strong acidic vapors.

Disposal

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

References

Relevant Sciencemadness threads