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An equimolar concentration of Fe^(2+) an...

An equimolar concentration of `Fe^(2+)` and `Fe^(3+)` what must be the `[Ag^+]` so that the value of the galvanic cell made from `Ag^+|Ag` and `Fe^(3+)|Fe^(2+)` electrodes equals zero? The cell reaction is
`Fe^(2+)+Ag^(+)LeftrightarrowFe^(3+)+Ag`

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