Dihydroxylamidosulphonic Acid, N(OH)₂SO₃H

A basic salt of Dihydroxylamidosulphonic Acid, N(OH)₂SO₃H, having the composition N(OH)(OK)SO₃K has been obtained as the first product of the interaction of sulphur dioxide with a concentrated alkaline solution of potassium nitrite. The salt is alkaline in solution and with barium chloride yields a white precipitate, soluble in acids. Sulphuric acid liberates nitrous oxide from it.