Mercury(II) sulfate, commonly called mercuric sulfate, is the chemical compound HgSO?. It is an odorless solid that forms white granules or crystalline powder. In water, it separates into an insoluble sulfate with a yellow color and sulfuric acid. Formula: HgSO4 Molar mass: 296.65 g/mol Solubility: soluble in hot H2SO4, NaCl solution; insoluble in alcohol, acetone, ammonia Density: 6.47 g/cm³ Appearance: white monoclinic crystals Crystal structure: rhombic UN Number: 1645 Used as an Electrolyte for Primary Batteries. Used in Extraction of Gold and Silver.