Q. 20

= 1.1 V for Daniel cell. Which of the following expressions are correct description of state of equilibrium in this cell?
A. 1.1 = Kc

B.

C.

D. log Kc = 1.1

Answer :

The electrode potential of any cell compared to standard hydrogen electrode is given by the Nernst equation, . Where E0 is the standard cell potential, R is the universal gas constant, T is the temperature in Kelvin, F is the Faraday constant, [Mn+] is the concentration of the electrolyte.


For a Daniell cell, the cell potential is given in the following equation after converting the natural logarithm to the base 10 and substituting the values of R, F and T = 298 K –


Ecell = - .


At equilibrium,


Ecell = 0. So, EӨcell =


Kc = [Zn2+]/[Cu2+]


So the equation can also be written as


EӨcell =


From these equations, it can be calculated that (ii) and (iii) are correct.

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