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Calomel electrode is represented as - H...

Calomel electrode is represented as -
`Hg(l)|Hg_(2)Cl_(2)(s)|HCl(aq),` Its `E^(@)` value is `+0.24V`. When it is connected to `Cu|Cu^(2+)(1M)` electrode `(E^(@)=+0.34V)`, what chemical reaction occurs at the calomel electrode?

Text Solution

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As `E^(@)` of the calomel electrode is smaller than that of the electrode `Cu^(2+)|Cu`, it will serve as the anode when it is connected to the copper electrode. At the anode, oxidation reaction takes place. So, the reaction at the calomel electrode being connected to the copper electrode will be
`2Hg(l)+2Cl^(-)(aq)rarr Hg_(2)Cl_(2)(s)+2e`
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