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Calculate the potential of a half cell h...

Calculate the potential of a half cell having reaction :`Ag_2S(s)+2e^(-)iff2Ag(s)+S^(2-)(aq)` in a solution buffered at `pH=3` and which is also saturated with 0.1 `MH_2`S(aq):
[Given:`K_(sp)(Ag_2S)=10^(-49),K_(a1)*K_(a2)=10^(-21)]`

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