出典:Wikipedia
出典:『Wikipedia』 (2011/05/05 19:14 UTC 版)
An organic acid is an organic compound with acidic properties. The most common organic acids are the carboxylic acids, whose acidity is associated with their carboxyl group -COOH. Sulfonic acids, containing the group -SO2OH, are relatively stronger acids. The relative stability of the conjugate base of the acid determines its acidity. Other groups can also confer acidity, usually weakly: -OH, -SH, the enol group, and the phenol group. In biological systems, organic compounds containing only these groups are not generally referred to as organic acids.