Formula: C₄H₄Na₂O₆ • 2H₂O CAS: 6106-24-7 EC No.: 212-773-3 M (Molar Mass): 230.08 g/mol

Assay (Titration): 99.0 - 101.0 % Appearance: White crystals. Specific Rotation [α]²⁰D: +27.0° to +28.0° (c=10 in H₂O) pH (5% solution): 7.5 - 8.5 Loss on Drying (105°C): 15.0 - 16.5 % Insoluble Matter: ≤ 0.005 % Chloride (Cl): ≤ 0.002 % Sulfate (SO₄): ≤ 0.005 % Heavy Metals (as Pb): ≤ 5 ppm Oxalate (as C₂O₄): Passes test.