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【简答题】
在25℃时，将2.0×10 -4 mol·dm -3 CdCl 2 和1.0mol·dm -3 HCl溶液等体积混合。通入H 2 S气体，使之饱和(c(H 2 S)=0.10mol·dm -3 )。此时CdS刚能开始沉淀，求CdCl 4 2- 配离子的稳定常数K 稳 。已知H 2 S的K 1 =1.32×10 -7 ，K 2 =7.10×10 -15 ，K sp (CdS)=8.0×10 -27 。
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