Soda ash, scientific name sodium carbonate, commonly known as soda, soda ash, washing soda, chemical formula Na?CO?, belongs to the salts, sodium carbonate with ten crystalline water for colorless crystals, the water of crystals is unstable, easy to weathering, into a white powder Na2CO3, a strong electrolyte, with a salt of the passivity and thermal stability, soluble in water, and its aqueous solution is alkaline.