羧基,2-COOH+2Na=2COONa+H2
-COOH+NaOH=-COONa+H2O
2-COOH+Na2CO3=2-COONa+H2O+CO2
-COOH+NaHCO3=-COONa+H2O+CO2
能和碳酸氢根反应的官能团,高中就羧基