Nomen commune Phenolphthalein CAS Number 77-09-8 Phenolphthalein Density 1.4±0.1 g/cm3 Phenolphthalein Boiling Point 557.8±50.0 °C at 760 mmHg Phenolphthalein Melting Point 258-263 °C Phenolphthalein Molecular Formula C20H14O4 Phenolphthalein Molecular Weight 318.323 Phenolphthalein Flash Point 206.5±23.6 °C Phenolphthalein Exact Mass 318.089203