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CAS#: 7778-77-0 | Formula: KH2PO4 | Specifications: Assay 99.0 % - Min, Chloride 0.001 % Max, Heavy Metals (by ICP-OES) 0.001 % Max, Insoluble matter 0.01 % Max, Iron 0.002 % Max, Loss on drying @ 105 C 0.2 % Max, pH of 5% solution @ 25 C 4.1 - 4.5 pH, Sodium 0.005 % Max, Sulfate 0.003 % Max