Sodium Tripolyphosphate Chemical name of Sodium Tripolyphosphate: Sodium Tripolyphosphate Chemical formula of Sodium Tripolyphosphate : Na5P3O10 CAS NO. of Sodium Tripolyphosphate：7758-29-4 Molecular weight of Sodium Tripolyphosphate : 367.86 Properties of Sodium Tripolyphosphate : White microdot powder with luster, melting point at 622℃, easily soluble in water, with remarkable chelating ability to some metal ions such as Ca2+ ,Mg2+ ,can soften hard water, change suspension into solution, alkalescent, without causticity. web:http://www.modernphos.net/product/sodium-tripolyphosphate