Question

What is ECELL and difference between normal cell and ECELL

Answer 1

E0cell is the standard electrode potential of cell i.e potential under standard condition when concentration of oxidised and reduced form is unity and temperature is 298 K.

It can be represented as:

E0cell = Eocathode-Eoanode

Ecell is the cell potential under normal condition . It is calculated by Nernst equation and give dependence of Ecell on concentration and temperature. 

Ecell = Ecathode-Eanode

Nernst equation is written as follows in general. Ecell = E0cell –RT/nF(ln[pdt]/[react]) here conc. of ion in aqueous form is taken as for pure solid and liquid conc. Is taken as

 For eg for Daniel cell Zn/Zn2+ (C1)// Cu2+(c2)/Cu

Overall cell reaction is- Zn(s) + Cu2+(aq) →Zn2+(aq)+ Cu(s) here in pdt conc [Zn2+] is taken and in reactant [Cu2+] conc is taken.