Structure and Properties of Carboxylic Acids Carboxylic acids are much weaker acids than mineral acids but much stronger acids than alcohols OH CH3CH2OH CH3COH HCI pKa =16 pKa=9.89 pKa=4.76 pKa=-7 AcidityCarboxylic acids are much weaker acids than mineral acids but much stronger acids than alcohols Structure and Properties of Carboxylic Acids