Chemistry
Chemistry
Problem
Without using numerical equilibrium constants, explain which of the following is the stronger acid in water and give a brief reason: formic acid (HCOOH) or acetic acid (CHCOOH). Your response should be one or two sentences.Intuitive explanation
Formic acid is the stronger acid because its conjugate base (formate, ) is stabilized by the electron-withdrawing inductive effect of the carbonyl carbon, with no alkyl group to destabilize it through electron donation. Acetic acid's methyl group donates electron density to the carboxylate ion, making it a weaker conjugate base and therefore a weaker acid overall.
Intuitive explanation
Formic acid is the stronger acid because its conjugate base (formate, ) is stabilized by the electron-withdrawing inductive effect of the carbonyl carbon, with no alkyl group to destabilize it through electron donation. Acetic acid's methyl group donates electron density to the carboxylate ion, making it a weaker conjugate base and therefore a weaker acid overall.