White powder.It easily absorps moisture and deliquesces, easily soluble in water and insoluble in ethanol. 1,Chemical Name: POTASSIUM PYROPHOSPHATE2,Molecular Formula : K4P2O73,Molecular Weight: 330.344,CAS: 7320-34-55,Character: White powder. The relative density is 2.534 and melting point is 1109°C. It easily absorps moisture and deliquesces, easily soluble in water and insoluble in ethanol.6, ...