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Equilibrium constant is related to E^(@) but not to E_(cell). Explain why? |
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Answer» Solution :When equilibrium is reached in the cell REACTION, BECOMES equal to ZERO. However `E_(cell)^(@)` is a CONSTANT quantitiy. Hence, applying Nernst equation to the cell reaction, e.g., to the reaction: `Zn+Cu^(2+)hArrZn^(2+)+Cu`, `E_(cell)=E_(cell)^(@)-(RT)/(nF)"LN"([Zn^(2+)])/((Cu^(2+)))=E_(cell)^(@)-(RT)/(nF)"ln "K_(c)`, At equilibrium `E_(cell)=0`. hence, `E_(cell)^(@)=(RT)/(nF)"ln "K_(c)`. |
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