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phthalic acid

noun

  1. Chemistry. any of three isomeric acids having the formula C 8 H 6 O 4 , especially the ortho isomer orthophthalic acid, a colorless, crystalline, slightly water-soluble solid used chiefly in the manufacture of dyes, medicine, and perfume.


phthalic acid

/ ˈfθæl-; ˈθælɪk /

noun

  1. a soluble colourless crystalline acid used in the synthesis of dyes and perfumes; 1,2-benzenedicarboxylic acid. Formula: C 6 H 4 (COOH) 2
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


phthalic acid

/ thălĭk,fthăl- /

  1. A colorless, crystalline organic acid prepared from naphthalene and used in the synthesis of dyes, perfumes, and other organic compounds. Chemical formula: C 8 H 6 O 4 .


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Word History and Origins

Origin of phthalic acid1

First recorded in 1855–60
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Word History and Origins

Origin of phthalic acid1

C19 phthalic, from phthal- (see phthalein ) + -ic
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Example Sentences

Thus the dinitronaphthol described as Manchester yellow, if heated for some time with dilute nitric acid, furnishes phthalic acid.

Phthalic acid, which was discovered in 1836 by Laurent, is a product of the oxidation of many benzenoid compounds.

Dilute nitric acid oxidizes it to phthalic acid, and sodium reduces it in alcoholic solution to hydrindene, C9H10.

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phthalicphthalic anhydride