| Title:  Mercurous Sulfate CAS Registry Number:  7783-36-0 Molecular Formula:  Hg2O4S Molecular Weight:  497.24 Percent Composition:  Hg 80.68%, O 12.87%, S 6.45% Line Formula:  Hg2SO4 Properties:  White to slightly yellow cryst powder.  Becomes gray on exposure to light with production of mercury and mercuric sulfate.  d 7.56.  Slightly sol in water (0.06 g/100g at 25°); sol in dil HNO3. Density:  d 7.56 Use:  For making electric batteries; with zinc sulfate in the standard Clark cell and with cadmium sulfate in the standard Weston cell.  |