Chemical Specifications Appearance Colorless crystals or a white, crystalline powder Assay (on anhydrous basis) 99 - 100.5% Solubility Freely soluble in water, very soluble in boiling water, practically insoluble in alcohol Identifications To comply IP, BP, USP tests Appearance of solution To comply IP, BP, USP tests pH (5% solution in water) 5.0 - 9.2 Acidity or alkalinity To comply IP, BP test Chloride (Cl) Max. 0.014% Heavy metal (as Pb) Max. 0.001% Arsenic (As) Max 0.0002% Iron (Fe) Max 0.002% Selenium (Se) Max 0.003% Loss on drying (at 450°C) 48.0 - 52.0%