Phenolphthalein
Phenolphthalein
Phenolphthalein (/ˌfiːnɒlfˈθeɪliːn/ fee-nolf-THAY-leen) is a chemical compound often used as a pH indicator in titrations. For this purpose, it turns colorless in acidic solutions and pink in basic solutions.
Etymology
The term "phenolphthalein" is derived from the three components that contribute to its structure: a phenol group, a phthalein (which is a type of heterocyclic compound), and an isobenzofuran.
Chemical Properties
Phenolphthalein is a weak acid, which can lose H+ ions in solution. The phenolphthalein molecule is colorless, and the phenolphthalein ion is pink. When a base is added to the phenolphthalein, the molecule ⇌ ions equilibrium shifts to the right, leading to more ionization as H+ ions are removed. This is predicted by Le Chatelier's principle.
Uses
Phenolphthalein's most common use is as a pH indicator. It is also used in various laboratory and diagnostic applications. In medicine, it was previously used as a laxative, but due to concerns about its potential carcinogenicity, it is not commonly used for this purpose anymore.
Related Terms
External links
- Medical encyclopedia article on Phenolphthalein
- Wikipedia's article - Phenolphthalein
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