Sodium percarbonate, Na₂C₂O₆

The percarbonate is said to be formed by the electrolytic oxidation of the normal carbonate, but it has not been isolated by this method. A substance of the formula 2Na₂CO₃,3H₂O₂ is obtained by the interaction of 3 molecules of hydrogen peroxide in aqueous solution and 2 molecules of sodium carbonate, the product being subsequently dried in vacuo. Other percarbonates have been described, but their existence is still a subject of debate.