PHTHALEIN

Noun

phthalein (plural phthaleins)

(organic compound) any of a range of lactones formed by the reaction of phenols with phthalic anhydride

Source: Wiktionary


Phthal"e*in, n. Etym: [See Phthalic.] (Chem.)

Definition: One of a series of artificial organic dyes made as condensation products of the phenols with phthalic acid, and well represented by phenol phthaleĂŻn. Their alkaline solutions are fluorescent. Phenol phthalein, a white or yellowish white crystalline substance made from phthalic acid and phenol. Its solution in alkalies is brilliant red, but is decolorized by acids, and as this reaction is exceedingly delicate it is used as an indicator.

Source: Webster’s Unabridged Dictionary 1913 Edition



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Word of the Day

12 January 2025

HABIT

(noun) (psychology) an automatic pattern of behavior in reaction to a specific situation; may be inherited or acquired through frequent repetition; “owls have nocturnal habits”; “she had a habit twirling the ends of her hair”; “long use had hardened him to it”


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Coffee Trivia

Raw coffee beans, soaked in water and spices, are chewed like candy in many parts of Africa.

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