Sodium bisulphite solution, min. 37 %, in water, Molar mass (M) 104,06 g/mol, Density (D) 1,19 to 1,36 g/cm³, Boiling point (bp) 105 to 146 °C, CAS No. [7631-90-5], EG-Nr. 231-548-0, Empirical formula NaHSO3