(Confirming to BP/USP)K2HPO4 M.W. 174.18Assay (acidimetric on dried subs) 98-100.5%pH(10% water) 8.5-9.5Appearace of solution passes testInsoluble matter in water max 0.2%Carbonate passes testChloride(Cl) max 0.02%Fluoride (F) max 0.001%Sulphate(SO4) max 0.05%Heavy metals(as Pb) max 0.001%Iron(Fe) max 0.001%Arsenic(As) max 0.0002%Sodium(Na) max 0.5%Potassium HydrogenPhosphate(KH2PO4) max 3.0%KMnO4 reducing Impurities(as O)max 0 .04%Loss on drying (1300C) max 1.0%