sodium carbonate: a sodium salt of carbonic acid used especially in making soaps and chemicals, in water softening, in cleaning and bleaching, and in photography: such as
a : a hygroscopic crystalline anhydrous strongly alkaline salt Na2CO3
b : the transparent crystalline hydrate Na2CO3·10H2O found in nature as natron
sodium carbonate: a colourless or white odourless soluble crystalline compound existing in several hydrated forms and used in the manufacture of glass, ceramics, soap, and paper and as an industrial and domestic cleansing agent
