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CAS#: 3609-96-9 | Formula: K2HC6H5O7 | Specifications: Assay 99.0 % - Min, Chloride 0.001 % Max, Heavy Metals (as Pb) (ppm) 30 ppm Max, Iron 20 ppm Max, Moisture 0.3 % Max, pH (5% in CO2 free water) (pH) 5.0 - 5.2 pH, Sulfate 0.02 % Max