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CAS#: 7558-79-4 | Formula: Na2HPO4 | Specifications: Absorbance (0.5M in H2O) @ 260 nm 0.030 Max, Absorbance (0.5M in H2O) @ 280 nm 0.027 Max, Al 5 ppm Max, Assay 99.5 % - Min, Ba 5 ppm Max, Bi 5 ppm Max, Ca 10 ppm Max, Cd 5 ppm Max, Chloride (Cl) 0.001 % Max, Co 5 ppm Max, Cr 5 ppm Max, Cu 5 ppm Max, Fe 5 ppm Max, Insoluble matter 0.01 % Max, K 50 ppm Max, Li 5 ppm Max, Loss on drying @ 105 deg. C (%) 0.1 % Max, Mg 5 ppm Max, Mn 5 ppm Max, Mo 5 ppm Max, Ni 5 ppm Max, Pb 5 ppm Max, pH (1M in water @ 20 deg. C) (pH) 8.8 - 9.4 pH, Sr 5 ppm Max, Sulfate (SO4) 0.005 % Max, Total Nitrogen (N) 0.001 % Max, Zn 5 ppm Max