Nernst Equation o This equation was named after a German physicist Walther Nernst . o
Nernst Equation o This equation was named after a German physicist Walther Nernst . o
The Nernst Equation empowers the assurance of cell potential under non-standard conditions and relates the measured cell potential to the reaction quotient and permits the exact measurement of equilibrium constants .
o Let us consider an electrochemical reaction of the following type : aA + bB -- > cC + dD o Nernst equation for this can be written as follows :
o In case of daniel cell Nerst equation is as follows :
o
o
The above equation implies that the value of increases with the increase in the concentration of Cu 2 + ion increases and decrease in the concentration Zn 2 +
Putting the values of R , F at T = 298 K . the equation becomes
o If the circuit in Daniel cell is closed : Zn ( s ) + Cu 2 + ( aq ) →Zn 2 + ( aq ) + Cu ( s )