2指示剂的变色点:(pM)n M In MIn ↓H Han K(MIn IMIn] K(MIn MIlIn In(h 当[MIn=[m 时,K(MIm)= M)=IgK(MIn )=IgK(MIn)-IgaIn(H (pM)=lgK(MIn)-Igain()-IgaM(pM)t -IgaM4 2. 指示剂的变色点：(pM)t          InH MIn MIn MIn M In K K      t 1 [M ]                 t In H t In H M t M pM = lg MIn = lg MIn -lg pM = lg MIn -lg -lg = pM -lg K K K       M + In MIn H+ HiIn 当[MIn]=[In]时，K(MIn)=