... Anhydrous Disodium phosphateChemical formula Na2HPO4Molecular weight 141.98Properties White powder,specific gravity is 1.52 . Soluble in water ... agent for fabric ,timber,and paper; as water softener for boilers, as food additive,buffer agent to acidty,as glaze,solder,baking powder ... ,tanning agent,and for manufacture of pyphosphate ...