Lead Hydrogen Sulphate, PbH₂(SO₄)₂

Lead Hydrogen Sulphate, PbH₂(SO₄)₂.H₂O. - Lead dissolves in hot and moderately concentrated sulphuric acid, in which also lead sulphate dissolves, forming an acid sulphate in solution. When this solution is diluted with water lead sulphate is precipitated, but if instead it is allowed to stand in the air crystals of the acid sulphate Pb(HSO₄)₂.H₂O are deposited. Barium sulphate behaves similarly.

Lead Pyrosulphate, PbS₂O₇, is formed by the union of PbSO₄ and SO₃. It has not, however, been obtained pure.