Gallic acid - Definition and Overview

Gallic acid is an organic acid, also known as 3,4,5-trihydroxybenzoic acid, found in gallnuts, sumac, witch hazel, tea leaves, oak bark, and other plants. The chemical formula is C₆H₂(OH)₃CO₂H. Gallic acid is found both free and as part of tannins.

The COOH group has a pKa of 4.5, and the phenolic OHs have pKa 10.

External link

King's American Dispensatory (1898) entry on Gallic acid (http://www.ibiblio.org/herbmed/eclectic/kings/acidum-gall.html)

Example Usage of Gallic
	vidiot_: Invited to a French dinner. Invite says the dessert will be "Tart Tartan." Gallic Highlanders?
	pkedrosky: @deepfoo You have to admit it's a magnificently Gallic gesture, a sort of galactic shoulder shrug.
	m17cdh: RT @miquelon: @m17cdh @GDayIrene @MrCrazy3000 @NavyLove_128 @monkeyofsteel @starsonharbors http://bit.ly/3wcFlp < gives Gallic shrug :)

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