Question

The electrode potential are
calculated by
O Stokes equation
O Nerst equation
O Ohms Law
O Ilkovic equation​

Answer 1

Explanation:

Electrode potential varies rapidly with temperature and concentrations of the species involved. Hence, to define one particular reference for electrode potentials, standard set of conditions have been defined. If potential is measured under these conditions, it is known as 'Standard Potential'.

The Nernst Equation enables the determination of cell potential under non-standard conditions. It relates the measured cell potential to the reaction quotient and allows the accurate determination of equilibrium constants (including solubility constants).

Nernst equation is given as:

E

cell

=E

cell

o

−

nF

RT

logQ

i.e. E

cell

=E

cell

o

−

n

0.0591

logQ at 25

o

C

The equation above indicates that the electrical potential of a electrode depends upon the reaction quotient Q of the reaction.

So if we are trying to determine reduction potential of Cu electrode, we will have to consider Cu

2+

+2e

−

→Cu

(s)

We can then Nernst Equation as:

E

Cu

2+

/Cu

=E

Cu

2+

/Cu

o

−

2

0.0592

log(

[Cu

2+

]

1

) at 25

o

C

This way we can determine the E

Cu

2+

/Cu

for Copper electrode at any temperature and concentration, if we know the standard reduction potential of Copper electrode i.e. E

Cu

2+

/Cu

o

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Answer 2

Nernst equation is used to calculate electrode potential.

Nernst equation is given by

$e_{cell} = e ^{0} _{cell} - { ^{rt} _{nf}(log \: q) }$

gives

$e_{cell} = e { _{cell}^{0} } - { _{n}^{0.0591}} log(q)$

at 25⁰C .

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