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To find the standard potential of M^(3+)...

To find the standard potential of `M^(3+)//M` electrode, the following cell is constituted :
`Pt|M|M^(3+) (0.0018 mol^(-1) L)||Ag^(+) (0.01 mol^(-1) L(|Ag`
The emf of this cell is found to be 0.42 volt. Calculate the standard potential of the half reaction `M^(3+)+3e^(-) rarr M`. `E_(Ag^(+)//Ag)^(@)=0.80` volt.

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