Calcium Imidosulphonate, Ca₃N₂(SO₃)₄

Calcium Imidosulphonate, Ca₃N₂(SO₃)₄, obtained by treating pure calcium hydroxide with a solution of diammonium imidosulphonate, has been described. It forms transparent crystals probably containing 10 molecules of water of crystallisation. There is also a calcium sodium imidosulphonate, CaNaN(SO₃)₂.3H₂O, and a calcium ammonium and a soluble acid calcium salt which have not been analysed.