Phenolphtalein IND ACS

C₂₀H₁₄O₄
M.W: 318,32  CAS: 77-09-8  EC: 201-004-7  TARIC: 29322010
EC INDEX: 604-076-00-1  

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• Appearance A white / almost white powder
• Assay 98.0 – 101.0%
• Identification Conforms
• Loss on drying ? 0.5%
• Residue on roasting (SO₄) ? 0.1%
• Acidity or alkalinity Conforms
• Chloride (Cl^–) ? 0.01%
• Appearance of solution Conforms
• Sulfates (SO₄) ? 0.02%
• Transition range pH 8.2 – 10
• colourless to red-violet
• Practically insoluble in water

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