We offer Soda Ash Light. We are the stockists Of TATA CHEMICALS LIMITED> Sodium carbonate (also known as washing soda, soda ash and soda crystals), Na2CO3, is a sodium salt of carbonic acid (soluble in water). It most commonly occurs as a crystalline heptahydrate, which readily effloresces to form a white powder, the monohydrate. Pure sodium carbonate is a white, odorless powder that absorbs moisture from the air, has an alkaline taste, and forms a strongly alkaline water solution. Sodium carbonate is domestically well known for its everyday use as a water softener. It can be extracted from the ashes of many plants. It is synthetically produced in large quantities from salt (sodium chloride) and limestone by a method known as the Solvay process.