phenolphthalein
nounUK /ˌfiː.nɒlˈ(f)θa.liːn/ · US /ˌfi.nl̩ˈθæl.i.ɪn/
Etymology From phenol + phthalein.
1
Chemistry, Medicine, Natural sciences, Organic chemistry, Pharmacology, Physical sciences, Sciences A white or yellowish-white crystalline compound C₂₀H₁₄O₄ used in medicine as a laxative and in analysis as an indicator because its solution is brilliant red in alkalies and is decolorized by acids.
- After transfering the acid to a 150-mL Erlenmeyer flask, add 60 mL of deionized water and 2 drops of phenolphthalein.
- Derived terms
- iodophthalein, tetrabromophenolphthalein, tetrachlorophenolphthalein
- Related terms
- phenolphthalin