Formula: C₁₅H₁₄N₃NaO₂ CAS: 845-10-3 EC No.: 212-682-9 M (Molar Mass): 291.28 g/mol D (Density): ~1.0 g/cm³ (approx.) mp (Melting Point): Decomposes bp (Boiling Point): Not applicable pH Range: 4.4 (red) - 6.2 (yellow)

Assay (Colorimetric): Suitable for use as pH indicator. Appearance: Reddish-brown powder. Identification: Passes test (color change in specified pH range). Solubility (in Water): Very soluble, giving a clear red-brown solution. Loss on Drying: ≤ 5.0 % Sensitivity Test (pH transition): Complies (clear color change between pH 4.4-6.2).