Electrochemical series helps us to calculate the standard

Last updated: 6/30/2023

Electrochemical series helps us to calculate the standard EMF of any cell However if the con centrations of the electrolytes in the halfcells are not 1 M and temprature is not 298 K Nernst equation is used to know the exact EMf of the cell Further using the identical electrodes but with different concentrations of the elctrolyte in the two half cells a cell can be set up called concen tration cell For cell reactions in equilibrium Nernst equation can be applied to find the equilibrium constant of these reactions from the standard EMF of the cell 0 75 V E Fe Given Er Cr 3 will be A 0 2409V 3 0 45 V the EMF of the cell Cr Cr 0 1M Fe 0 01M Fe DY 0 2606 V B 0 3394 V C 0 30 V The Equlibrium constant of the cell reaction will be of the order of A 1010 B 1020 C 1030 D 1040 The iron electrodes are used in both the half cells but in one halfcell 0 1M FeSO4 solution is taken but in the other 0 01M FeSO solution is taken the EMF of the cell will be A 0 591 V B 0 0295 V C 0 0098 V D 0 0197 V 11