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:
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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)