共轭酸碱对的K0与K0的关票 例共轭酸碱对HAc-Ac同时存在下述平衡 (I)HAC H2o= H3o++ Ac (2)Ac- +H,O= HAc +OH 平衡常数分别为: C(H/CC(Ac-)/c Ka(HAc) C(HAc)/C C(HAC)/C.(0H-)/C C(H)/ K KL(AC= C(Ac )/c C(H)/c KahAl K(HAc).K(Ac)=Kwe_ _ ( ) / . ( ) / ( ) ( ) / ( ) / . ( ) / ( ) / ( ) . ( ) / ( ) / ( ) a w b a c H c c Ac c K HAc c HAc c c HAc c c OH c c H c K K Ac c Ac c c H c K HAc             + + − − + = = = 共轭酸碱对的Ka 与Kb 的关系 例 共轭酸碱对HAc-Ac-同时存在下述平衡 (1)HAc + H2O = H3O+ + Ac- (2)Ac− + H2O = HAc + OH− 平衡常数分别为： Ka  (HAc).Kb  (Ac- ) = KW 