Chemistry
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Phenolphthalein
Molecular formula: C20H14O4
Properties: white or light yellow crystals. Soluble in ethanol, less soluble in ethyl ether, insoluble in water.
| PH change color range | 8.0(achromatism)-10.0(purple) |
| Quality absorption coefficient L/cm.g | 68.0-75.0 |
| Dissolve in ethanol test | pass |
| Loss on drying | ≤1.0% |
| Residue on ignition (count with sulfate) | ≤0.05% |



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