phenolphthalein

phe·nol·phthal·ein

P0240900 (fē′nōl-thăl′ēn′, -thăl′ē-ĭn, -thā′lēn′, -thā′lē-ĭn)n. A white or pale yellow crystalline powder, C₂₀H₁₄O₄, used as an acid-base indicator, in making dyes, and formerly in medicine as an over-the-counter laxative.

phenolphthalein

(ˌfiːnɒlˈθeɪliːn; -lɪɪn; -ˈθæl-) n (Chemistry) a colourless crystalline compound used in medicine as a laxative and in chemistry as an indicator. Formula: C20H14O4

phe•nol•phthal•ein

(ˌfi nɔlˈθæl in, -i ɪn, -ˈfθæl-, -nɒl-)

n. a white, crystalline compound, C₂₀H₁₄O₄, used as an indicator in acid-base titration and as a laxative. [1870–75]

phe·nol·phthal·ein

(fē′nōl-thăl′ēn′) A white or pale-yellow, crystalline powder used as an indicator for acid and basic solutions. It is also used as a laxative and in making dyes.

Thesaurus

Noun

phenolphthalein - a laxative used in many preparations under various trade names; also used as an acid-base indicator in titrations involving weak acids and strong bases because it is brilliant red at high alkalinity and colorless below pH 8laxative - a mild catharticacid-base indicator - an indicator that changes color on going from acidic to basic solutions

phenolphthalein

(fē`nôlthăl`ēən), or 2,2-Bis(p-hydroxyphenyl) phthalide, C₂₀H₁₄O₄, crystalline organic compound. It is used medicinally as a laxative and is widely employed in the laboratory as an indicatorindicators, acid-base,
organic compounds that, in aqueous solution, exhibit color changes indicative of the acidity or basicity of the solution. Common indicators include p-nitrophenol, which is colorless from pH 1 to 5 and yellow from p
..... Click the link for more information. of the acidity or basicity of solutions. In pure water it is insoluble, but it is soluble in basic solutions or in ethanol or acetone. In a solution with pH greater than 8 (pH 8 is mildly basic) phenolphthalein is pink to red in color, but at pH less than 8 it is colorless. Phenolphthalein is a phenol derivative of phthalic anhydride.

Phenolphthalein

(also 4, 4’-dihydroxyphthalophenone), C₂₀H₁₄0₄, a colorless, odorless, and tasteless crystalline compound that is only slightly soluble in water but highly soluble in alcohol. The melting point is 259°–263°C. The compound is obtained through the condensation of phenol with phthalic anhydride.

Phenolphthalein is used in analytical chemistry as an indicator in the titration of acids and alkalies (the compound being colorless in neutral and acidic mediums and raspberry red in weakly alkaline mediums, the interval for the color change being pH 8.2–10). In medicine, the compound is used as a laxative, the therapeutic effect of which derives from increased peristalsis of the large intestine. Phenolphthalein is prescribed in tablet form as a treatment for chronic constipation, each tablet containing 0.1 g of the compound.

phenolphthalein

[¦fē‚nȯl′thal·ē·ən] (organic chemistry) (C₆H₄OH)₂COC₆H₄CO Pale-yellow crystals; soluble in alcohol, ether, and alkalies, insoluble in water; used as an acid-base indicator (carmine-colored to alkalies, colorless to acids) for titrations, as a laxative and dye, and in medicine.

phenolphthalein

[fe″nol-thal´ēn] a cathartic and pH indicator.

phe·nol·phthal·e·in

(fē'nol-thal'ē-in, -thal'ēn), A hydrogen ion indicator obtained by the action of phenol on phthalic anhydride; formerly used as a laxative.

phenolphthalein

(fē′nōl-thăl′ēn′, -thăl′ē-ĭn, -thā′lēn′, -thā′lē-ĭn)n. A white or pale yellow crystalline powder, C₂₀H₁₄O₄, used as an acid-base indicator, in making dyes, and formerly in medicine as an over-the-counter laxative.

phenolphthalein

phe·nol·phthal·ein

phenolphthalein

phe•nol•phthal•ein

phe·nol·phthal·ein

phenolphthalein

phenolphthalein

Phenolphthalein

phenolphthalein

phenolphthalein

phenolphthalein

phe·nol·phthal·e·in

phenolphthalein

phenolphthalein

Words related to phenolphthalein

noun a laxative used in many preparations under various trade names

Related Words