Phenolphthalein
 Phenolphthalein sample (middle), and dissolved in an acid (left) and a base (right).
| |
| Names | |
|---|---|
| IUPAC name
3,3-bis(4-hydroxyphenyl)isobenzofuran-1(3H)-one
| |
| Systematic IUPAC name
Phenolphthalein | |
| Other names
HIn
phph | |
| Identifiers | |
| Jmol-3D images | Image |
| |
| Properties | |
| C20H14O4 | |
| Molar mass | 318.33 g/mol |
| Appearance | White powder |
| Density | 1.3 g/cm3 (at 20 °C) |
| Melting point | 262.5 °C (504.5 °F; 535.6 K)[1] |
| Boiling point | Decomposes |
| 0.04 g/100 ml | |
| Solubility | Very soluble in acetone, ethanol and pyrene Soluble in chloroform, diethyl ether, and toluene Slightly soluble in carbon disulfide Insoluble in benzene, hexane, petroleum ether |
| Vapor pressure | 6.7·10-13 mm Hg at 25 °C |
| Hazards | |
| Safety data sheet | Acros Organics |
| Flash point | Non-flammable |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
| Infobox references | |
Phenolphthalein is an organic chemical compound, often used as an indicator in acid–base titrations. For this application, it turns colorless in acidic solutions and pink in basic solutions.
Contents
Properties
Chemical
Phenolphthalein is colorless at acidic and neutral pH and pink at basic pH.
Physical
Phenolphthalein is a white solid, poorly soluble in water but very soluble in ethanol.
Availability
Phenolphthalein is sold by various chemical suppliers.
Preparation
Phenolphthalein can be prepared by reacting phenol with phthalic anhydride, in the presence of anhydrous aluminium chloride and zinc chloride. Thionyl chloride can substitute aluminium chloride.
Projects
- Base indicator
- Ferroxyl indicator solution
Handling
Safety
Phenolphthalein, if taken orally, is mildly toxic, a suspected carcinogen and a powerful laxative. Several decades ago, it was commonly used as such in medicine. Today, less toxic laxatives are used.
Storage
In closed bottles, away from acidic vapors.
Disposal
Can be destroyed with a strong oxidizer, such as Fenton's reagent, chromic acid or piranha solution, neutralized and poured down the drain.
References
- ↑ Lide, D.R., G.W.A. Milne (eds.). Handbook of Data on Organic Compounds. Volume I. 3rd ed. CRC Press, Inc. Boca Raton ,FL. 1994., p. V4 3297
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- Chemical compounds
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