12-02509. Cobaltous Potassium Sulfate [Archived]

Nomenclature

CAS number: 13596-22-0
Potassium cobaltosulfate; potassium cobaltous sulfate; potassium disulfatocobaltate(II).
CoK2O8S2; mol wt 329.26.
Co 17.90%, K 23.75%, O 38.87%, S 19.48%.
K2Co(SO4)2.

Description and references

Prepn: Gmelins, Cobalt (8th ed.) 58 (part A), 414 (1932) and supplement, 782-786 (1961).

Derivative

Hexahydrate.

Properties

Red, monoclinic, prismatic crystals. Loses water on heating above 75°, forming the reddish-brown dihydrate which is stable from 120 to 150°; becomes anhydr (violet solid) at about 200°. d420 2.22. Freely sol in water.

Status

This monograph has been retired and is no longer subject to revision or update.