cas.no:10101-89-0 cas.no:7601-54-9 properties: white or colorless crystals, efflorescent in air, easily soluble in water but not in organic solution. its water solution is alkaline. ph value of 1% solution is 12.1, relative density at 1.62, melting point is 73.4 . application: used as a water softening agent, cleaning agent in electroplating, color fixer in fabric dyeing and flux in enamel ware manufacturing and so on.