(4)计量点后Va<VaoH 溶液pH决定于过量NaOH浓度。 当VNa0H=20.02ml(误差+0.1%) OH」= NaOH-VHCI)C Naoh NAoh +vhcl poH=430pH=9704 (4) 计量点后VHCl<VNaOH • 溶液pH决定于过量NaOH浓度。 • 当VNaOH=20.02ml(误差+0.1%) pOH=4.30 pH=9.70   NaOH HCl NaOH NaOH HCl V V V V C OH + − = − ( )