or
Potassium Phosphate, Monobasic, Crystal AR^ Assay (KH2PO4) (by acidimetry): min. 99. 0 %. Chloride (Cl): max. 0. 001 %. Heavy Metals (as Pb): max. 0. 001%. Insoluble Matter, Calcium and NH4OH Precipitate: max. 0. 01%. Iron (Fe): max. 0. 002 %. Loss on Drying at 105 [degree]C max. 0. 2%.