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简答题已知Hg2Cl2的溶度积为2.0×10-18,KCl的溶解度为330g•L-1溶液,EΘHg2+,Hg=+0.80V,试计算饱和甘汞电极的电极电位。
  • 已知:Ksp(Hg2Cl2)=2.0×10-18
    [Cl-]=330g•L-1/74.5g•mol-1=4.43mol•L-1
    EHg22+,Hg=+0.80V
    Hg2Cl2+2e=2Hg+2Cl-
    Hg2Cl2=Hg22++2Cl-
    Hg22++2e=2Hg
    E=EΘHg22+,Hg+(0.0592/2)lg[Hg22+]
    =EΘHg22+,Hg+(0.0592/2)lgKsp(Hg2Cl2)-0.0592lg[Cl-]
    =+0.80+(0.0592/2)lg2.0×10-18-0.0592lg4.43
    =0.24V
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