三溶解度S ◆难溶化合物在水溶液中的浓度,为水中 分子浓度和离子浓度之和 S=S+[M]=S+[4]~[M]=[A] 2.活度积 activity product constant-K) ∵K M+ M f→K0=K.S MA(水) 活度积K=a·a(T定,K为常数) Km=ana=M]”nAy →溶度积KMm:7 =M[4 2021/2/4 WZU-Department of Chemistry Material Science >|K2021/2/24 WZU-Department of Chemistry & Material Science 溶解度S： • 2. 活度积(activity product constant—Kap) + − + − + −  =  =   =  = a p M A M A MA M A K K S a a S a a a a a K 0 0 0 （水）  活度积 ( 一定， 为常数) 0 + − T Kap =  M A 0 ap K a a = +  − =  +   − + − M A M A 0 ap K a a [M ] γ [A ] γ [ ] [ ] + − =    = + − M A γ γ K K M A 0 a p 溶度积 SP ❖ 难溶化合物在水溶液中的浓度 ， 为水中 分子浓度和离子浓度之和 [ ] [ ] [ ] [ ] 0 + 0 − + − S = S + M = S + A  M = A