... 0.90g/ml, melting point: 622°C, easily dissolving in water; water solution is alkaline(PH value of 1% solution is ... 9.7); can hydrolyze into phosphate in water, has good ability in complexing metal ions,; can be used to soften ... be used as water softener for industrial water, pretanningagent and dyeing adjuvant; drilling mud dispersant; dispersant in preparing suspension in paint, kaolinite, ...