Converting measured potentials to standard potentials: In investigating the properties of
Channel: Doubtnut
Date: 2020-08-30

Converting measured potentials to standard potentials: In investigating the properties of rare and expensive metal such as rhenium `(Z = 75)`, it is both impractical and uneconomical to prepare cells with standard concentrations. The find the standard potential of the `Re^(3+)(aq.)//Re(s)` electrode, the following cell is constructed:  `Pt(s) | Re(s)| Re^(3+)(aq., 0.018 M)|| Ag^(+)(aq., 0.010 M) | Ag(s)` The potential of this cell is found to be `0.42 V` with the `Re` electrode as the node. Calculate the standard potential of the half reaction `Re^(3+)(aq.)+3e^(-)hArrRe(s)` Strategy: Table 3.1 lists the `E_(@)` for the `Ag^(+)(aq.) | Ag(s)` electrode as `0.80`. We can find the `E^(@)` of the other electrode by finding the `E^(@)` of the cell through the application of the Nernst equation