intro:
Product Name    sodium hydrogen phosphate
CAS RN             7558-79-4
EINECS RN        231-448-7
Molecular Formula Na₂HPO₄
Molecular Weight  141.9588
Properties colorless transparent monoclinic diamond crystal, Relative Density: 1.52; soluble in water, insoluble in alcohols. 
Use As water softener, textiles weighting agent, fireproofing agent etc.