Potassium Cobalt Sulphate, K₂SO₄.CoSO₄

Potassium Cobalt Sulphate, K₂SO₄.CoSO₄.6H₂O, is prepared in an analogous manner to the ammonium salt (vide supra). Its solubility in water is given as follows:

Temperature ° С	0	12	15	20	30	40	49
Grams of K2SO4.CoSO4 in 100 grams H2O	19.1	30	32.5	39.4	51.9	64.6	81.3

Its density is 2.212.