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For the electrochemical cell show below `Pt|H_(2)(P=1 atm|H+(aq., x M)||Cu^(2+)(aq., q.0 M)|Cu(s)` the potential is 0.49 V at 298 K. The pH of the solution is closest to [Given: Standard reduction potential `E^(@)` for `Cu^(2+)//Cu` is 0.34 V gas constant , R is 8.31 J K-1 `mol^(-1)` Farady constant , F is `9.65xx104 JV^(-1) mol^(-1)]`A. 1.2B. 8.3C. 2.5D. 3.2 |
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Answer» Correct Answer - C `E=E^(@)=(0.591)/(n) log"" ("[Oxidation]")/("[Reaction]")` `0.49=0.37-(0.0591)/(n) log ""([H^(+)]^(2))/(P_(H_(2))xx1)` `0.15=(0.055)/(2)xx2- (log[H^(+)]^(2))/(pH)` `0.15=0.055xxpH` `pH=2.5` |
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