Calculate the potential of a half cell having reaction: \( \mathrm{Ag}_{2} \mathrm{~S}(s)+2 e^{-...

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Calculate the potential of a half cell having reaction: \( \mathrm{Ag}_{2} \mathrm{~S}(s)+2 e^{-} \rightleftharpoons 2 \mathrm{Ag}(s)+\mathrm{S}^{2-}(a q) \) in a solution buffered at \( \mathrm{pH}=3 \) and which is also saturated with \( 0.1 \mathrm{MH}_{2} \mathrm{~S}(a q) \) :
[Given: \( K_{\mathrm{sp}}\left(\mathrm{Ag}_{2} \mathrm{~S}\right)=10^{-49}, K_{a_{1}} \cdot K_{a_{2}}=10^{-21} \) ]
(a) \( 1.18 \)
(b) \( 0.19 \)
(c) \( -0.19 \mathrm{~V} \)
(d) none of these
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