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This monograph for Sodium Sulfate, Anhydrous provides, in addition to common physical constants, a general description including typical appearance, applications, change in state (approximate), and aqueous solubility. The monograph also details the following specifications and corresponding tests for verifying that a substance meets ACS Reagent Grade specifications including: Assay, pH of a 5% Solution at 25.0 °C, Insoluble Matter, Loss on Ignition, Chloride, Nitrogen Compounds, Phosphate, Heavy Metals, Iron, Calcium, Magnesium, Potassium, and Extraction−Concentration Suitability.