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 0702 (OTTO) Sodium carbonate, ACS, anhydrous, 99.5% Cas 497-19-8 - used as an inorganic base and a buffer component in several synthetic organic transformations in both chemical industries and research laboratories.