Molecular Formula: KH2PO4; GR (AR) grade; CAS No.: 7778‐77‐0; Purity: >99.0% (T); Solubility in water: to past test; pH (50g/ml, 25oC): 4.2~4.6; Heavy metals (as Pb): max. 0.001%; Arsenic (As): max. 1ppm