Formula: NH2C6H4SO3H Grade: ACS, Reag. Ph Eur CAS No.: 121-57-3 pH: 2.5 (10 g/l, H2O, 20°C) Solubility: 10 g/l (20°C) Melting Point: 288°C decomposes Molar Mass: 173.18 g/mol Bulk Density: 620 kg/m3 Density: 1.485 g/cm3 (25°C) Ignition Point: >400°C Hill Formula: C6H7NO3S