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＝0.2?10?209.1?10?4?4.3?10?5 ?14?9?9.1?10?9.1?4.3?10 ＝0.2(mol/l)
到等当点时 [L]=0.1 mol/l
?Pb(L)=1+?1[L] =1+103.8-1 =102.8
?Pb(OH-)=102.7 ?Pb=?Pb(L)+?Pb(OH-)-1 =102.8+102.7-1 =103.05
?Y(H)=0.5
lgK?PbY=lgKPbY-lg?Y-lg?Pb =18.0-0.5-3.05 =14.4
1pPb?eg=(pCPbeg+lgK?PbY)
21 =(2+14.4)
2 =8.2
注意[Pb?eg]还包括羟基络合物，正确的称法是
2+
[Pb]=
[Pb'eg]Pb10?8.2??3.05?10?11.3 10[PbL]=KPbL[Pb2+][L]=103.8-11.3-1.0=10-8.5