7683. Potassium Tetracyanomercurate(II)

Nomenclature

CAS number: 591-89-9
Dipotassium tetrakis(cyano-C)mercurate(2-); mercuric potassium cyanide.
C4HgK2N4; mol wt 382.86.
C 12.55%, Hg 52.39%, K 20.42%, N 14.63%.
K2[Hg(CN)4].

Properties

Colorless or white crystals. Sol in water. Poisonous.

Use

In manuf of mirrors to prevent the silver coating from becoming yellow; as reagent in testing for free acids.