当CH3COO-未水解时：c(CH3COO-)=c(Na+)

CH3COONa溶液中

②、物料守恒

c(水解离子)始=c(水解离子)平+水解生成的相应微粒浓度之和

水解

CH3COO- + CH3COOH

c(CH3COO-)始=c(CH3COO-)平+c(CH3COOH)

c(CH3COO-)始=c(Na+)=c(CH3COO-)平+c(CH3COOH)

c(Na+)=c(CH3COO-) +c(CH3COOH)

NaHCO3溶液中

c(Na+)=c(HCO3-)+c(CO32-)+c(H2CO3)