The EMF of the cell `M|M^(n+)(0.2M)||H^(+)(1M)|H_(2)(g)(1atm), Pt` at `25^(@)C` is 0.81 V. Calculate the valency of the metal if the standard oxidatio

Question

The EMF of the cell `M|M^(n+)(0.2M)||H^(+)(1M)|H_(2)(g)(1atm), Pt` at `25^(@)C` is 0.81 V. Calculate the valency of the metal if the standard oxidatio

The EMF of the cell `M|M^(n+)(0.2M)||H^(+)(1M)|H_(2)(g)(1atm), Pt` at `25^(@)C` is 0.81 V. Calculate the valency of the metal if the standard oxidation potential of the metal is 0.76 V.

Monjur Alahi

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2025-01-04 04:42

1 Answers

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Salim Ahmed Kawsar · Accepted Answer · 2023-02-05T15:29:48+06:00

Salim Ahmed Kawsar

Correct Answer - `n=2`
`(MtoM_((0.02M))^(n+)+ne^(-))xx2`
`(2H^(+)+2e^(-)toH_(2))xxn`
`2M+2nH^(+)to2M^(n+)+nH_(2)`
`0.81=(0.76+0)-(0.0591)/(2n)log(((0.02)^(2))/((1)^(2n)))implies(0.81-0.76)=(0.0591)/(2n)log4xx10^(-4)`
`n=-(0.0591)/(2xx0.5)xxlog4xx10^(-4)=-0.591(-4+0.6)=2`.

4 views Answered 2023-02-05 15:29