Potassium selenate, K₂SeO₄

Electrolytic oxidation of the solution of selenite formed by the interaction of selenious acid and potassium carbonate yields Potassium selenate, K₂SeO₄, rhombic crystals of density 3.066 at 20° C. At the same temperature its solubility is 111 grams per 100 grams of water. Electrolytic oxidation of its solution acidified with selenic acid converts the selenate into potassium per selenate.