Formula: KNaC₄H₄O₆·4H₂O CAS: 6381-59-5 EC No.: 228-973-0 M (Molar Mass): 282.22 g/mol D (Density): 1.79 g/cm³ mp (Melting Point): 70-80 °C (loses water), ~200 °C (anhydrous decomposes) bp (Boiling Point): Not applicable Optical Rotation: [α]²⁰D +28.0° to +30.0° (c=2 in H₂O)

Assay (Iodometric): ≥ 98.0 % Appearance: Colorless transparent crystals or white crystalline powder. Identification (Tartrate): Passes test. Specific Rotation: [α]²⁰/D = +28.5° to +29.5° Solubility (1g in 1mL water): Clear, colorless solution. Chloride (Cl): ≤ 0.005 % Sulfate (SO₄): ≤ 0.01 % Heavy Metals (as Pb): ≤ 10 ppm Loss on Drying (105°C): 23.0-27.0 % (corresponds to 4H₂O)