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Technical Data Sheet Phenolphthalein
Compound Information
Product Name:
Phenolphthalein
CAS No.:
77-09-8
Molecular Formula:
C20H14O4
Molecular Weight:
318.32
Storage:
Store at RT
Revision Date:
2026-04-15
Analytical Information
| Tests | Specifications |
|---|---|
| Appearance | White or yellowish-white solid |
| Clarity | Clarity of alcohol solution: To pass test |
| Solubility | Soluble in alcohol. Slightly soluble in ether. Slightly soluble in dimethyl sulfoxide and insoluble in benzene or hexane. |
| Melting Point | 261-263 °C (lit.) |
| Density | 1.27 g/cm3 at 32 °C |
| pKa | 9.7 |
| Visual Transition Range | From pH 8.0 (Colorless) to pH 10.0 (Red) |
| Specification Reference | ACS reagent |
| Application | Used as indicator for acidimetric titrations. |
| MS | Pass test |
| ¹H NMR | Pass test |
| ¹³C NMR | Pass test |
| IR | Pass test |
| Raman | Pass test |
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