Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), Na2CO3, is the water-soluble sodium salt of carbonic acid.
S 0716 (OTTO) Sodium carbonate, ACS, anhydrous, 99.95% Cas 497-19-8 - used as a water softener in laundering, processing wood pulp, cleaners, and making glass. S 0716 (OTTO) Sodium carbonate, ACS, anhydrous, 99.95% Cas 497-19-8 - used for standardization of acids, and qualitative testing of cations.