| Formula / Notation | C20H14O4 |
|---|---|
| CAS Number | 77-09-8 |
| Molecular Weight | 318.3 |
| Melting Point | 496 to 504 °F (NTP, 1992) |
| Density | 1.299 at 77 °F (NTP, 1992) - Denser than water; will sink |
| Solubility | less than 1 mg/mL at 66 °F (NTP, 1992) |
| Appearance | Phenolphthalein appears as white or yellowish-white to pale orange fine crystalline powder. Odorless. Aqueous solution is acidic. Colorless to pH 8.5; pink to deep-red above pH 9. Colorless in pres... |
| Also Known As | 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one; 77-09-8; Phthalimetten; Euchessina; Phenolax; Phthalin; Espotabs; Purgophen; Koprol; Laxogen |
| Category | Indicators |
What is Phenolphthalein?
Phenolphthalein can cause cancer according to The Food and Drug Administration (FDA) and The National Toxicology Program.
Formula & Notation
IUPAC Name: 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one
Other Names / Synonyms: 3,3-bis(4-hydroxyphenyl)-2-benzofuran-1-one; 77-09-8; Phthalimetten; Euchessina; Phenolax; Phthalin; Espotabs; Purgophen; Koprol; Laxogen
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Melting Point | 496 to 504 °F (NTP, 1992) |
| Density | 1.299 at 77 °F (NTP, 1992) - Denser than water; will sink |
| Molecular Weight | 318.3 |
| Solubility | less than 1 mg/mL at 66 °F (NTP, 1992) |
| Appearance | Phenolphthalein appears as white or yellowish-white to pale orange fine crystalline powder. Odorless. Aqueous solution is acidic. Colorless to pH 8.5; pink to deep-red above pH 9. Colorless in pres... |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Phenolphthalein can cause cancer according to The Food and Drug Administration (FDA) and The National Toxicology Program.
Used as a pH indicator in acid-base titrations, analytical chemistry, and chemical education demonstrations.
May be irritant or toxic in concentrated form. Handle with care. Consult SDS before use.
The formula or notation for Phenolphthalein is: C20H14O4