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。
正确答案:
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
[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
答案解析:有
微信扫一扫手机做题