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Properties of anhydrous sodium sulfate (15124-09-1): white orthogonal bipyramidal crystalline or crystalline powder. There is moisture absorption. Soluble in about 3.6 parts water, insoluble in ethanol. Melting point about 800 °C; d 2.7。 Specification GB/T 9853-1988 Analytical Purity Chemical Purity Content (Na2S04)/%≥ 99.0 98.0 pH value (50g/L solution, 25°C) 5.0~8.0 5.0~8.0 Clarity test Qualified Qualified Water insoluble/%≤ 0.005 0.02 Loss on ignition/%≤ 0.2 0.5 Chloride (Cl)/%≤ 0.001 0.005 Total nitrogen (N)/%≤ 0.0005 0.001 Phosphate (PO4)/%≤ 0.001 0.002 Calcium (Ca)/%≤ 0.002 0.005 Iron (Fe)/%≤ 0.0005 0.0015 Heavy metals (in pb)/%≤ 0.0005 0.002 Potassium (K)/%≤ 0.01