3.计量点 溶液中的[Zn]来自络合物ZnY2的解离 [Znlp=[Y'p ZnY CZn.sp Kay=2n'TY]In'E znl。= CZn,sp pin'-+ 3. 计量点 溶液中的[Zn']来自络合物ZnY2-的解离              ( ) Zn,s p ZnY ZnY Zn,s p s p 2 s p Zn,s p ZnY s p s p pc lgK 2 1 pZn K c Zn Zn c Zn Y ZnY K Zn' Y  = +    =  =    = = 