Acid Barium Selenate, BaSO₄.H₂SO₄

Acid Barium Selenate, BaSeO₄.H₂SO₄, has been obtained similarly to the acid sulphate by dissolving barium selenate in selenic acid. By electrolytic transport it can be caused to crystallise round the anode, and so it is probably to be regarded as barium selenic acid, H₂[Ba(SeO₄)₂]. A concentrated solution of selenic acid saturated with barium selenate also deposits crystals of barium selenic acid.