CH3COOH = CH3COO- + H+（可逆） Ka = 1.75×10^-5CH3COO- + H2O = CH3COOH + OH-（可逆） Kh=Kw/Ka=5.71×10^-10可知等浓度的CH3COOH与CH3COO-相比，CH3COOH电解程度大于CH3COO-水解程度，溶液显酸性。
