Question

What is Nernst equation ? Write the equation for an electrode with electrode reaction `M^(n+)(aq)+ne^(-) hArr M(s).`

Answer 1

The electrode potential at any concentration measured with respect to standard hydrogen electrode is represented by Nernst equation.
Nernst equation is
`E=E^(0) +(RT)/(nF) ln[M^(x+)]` [Metal Electrodes]
Given electrode reaction is `M_((aq))^(n+)+ne^(-) hArrM_((s))`
For the above electrode reaction Nernst equation is
`E_((M^(n+)//M))=E_((M^(n+)//M))^(0)+(RT)/(nF)ln [Mn^(+)]`
Here `E_((M^(n+)//M))=` Electrode potential
`E_((M^(n+)//M))=` Standard Electrode poteitial
R= gas constant `=8.314` J/K mole
F = Faraday = 96487 c/mole
T = temperature
`[M^(n+)]=` concentration of species `M^(n+)`