Potassium percarbonate, K₂C₂O₆

Electrolysis of a solution of the normal carbonate between -30° and 40° C. yields a 90 per cent. Potassium percarbonate, K₂C₂O₆, a very unstable substance, readily converted into the primary carbonate and oxygen. It is a white, crystalline powder, and is decomposed energetically by water with evolution of oxygen.