Gallic-acid meaning

găl'ĭk, gô'lĭk
A colorless crystalline polyphenol, C7 H6 O5 , derived from certain tannins and used as a tanning agent, as an ink dye, in photography, and in pharmaceuticals.
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A nearly colorless, crystalline acid, (OH)3C6H2COOH, prepared from tannins, etc. and used in photography and the manufacture of inks, dyes, etc.
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(chemistry) A phenolic carboxylic acid, 3,4,5-trihydroxybenzoic acid, found in galls, tea, the bark of some trees etc; a constituent of tannin.
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(chemistry) The supposed acid H3GaO3, the acid form of the amphoteric gallium hydroxide Ga(OH)3, known only as alkali metal salts.
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Origin of gallic-acid

French acide gallique from galle plant gall gall3

Sentence Examples

  • Potassium chlorate and hydrochloric acid oxidize phenol, salicylic acid (o-oxybenzoic acid), and gallic acid ([2.3.4] trioxybenzoic acid) to tri chlorpyroracemic acid (isotrichlorglyceric acid), CC13 C(OH)2 C02H, a substance also obtained from trichloracetonitrile, CC1 3 CO CN, by hydrolysis.

  • Its exports include timber, citrons, skins, chestnuts and gallic acid.

  • Tannic acid is absorbed as gallic acid into the blood and eliminated as gallic and pyrogallic acids, darkening the urine.

  • It may be prepared by keeping moist and exposed to the air for from four to six weeks, at a temperature of 20° to 25° C., a paste of powdered gall-nuts and water, and removing from time to time the mould which forms on its surface; the paste is then boiled with water, the hot solution filtered, allowed to cool, the separated gallic acid drained, and purified by dissolving in boiling water, recrystallization at about 27° C., and washing of the crystals with ice-cold water.

  • Unlike tannic acid, gallic acid does not precipitate albumen or salts of the alkaloids, or, except when mixed with gum, gelatin.

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Words near gallic-acid in the Dictionary