= Organic acid
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An <organic acid> is an <organic compound> capable of donating a <proton> in an acid-base reaction. <Carboxylic acids> and <sulfonic acids> are important families, but acidic organic compounds need not all contain the same <functional group>.
Acid strength, quantified by an <acid dissociation constant>, depends on the stability and solvation of the <conjugate base>. Comparing different <organic acids> therefore requires a specified <solvent> and a defined equilibrium, rather than simply counting acidic hydrogen atoms.
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