Chemistry, asked by sheikhsahil7159, 5 months ago

1.
What is Nernst equation ? How can it be applied in calculating the
equilibrium constant for the cell Zn(s)/ZnSO, aq || CuSO_(aq)/Cu(s) ?
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Answered by sharifasharifa819
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12th

Chemistry

Electrochemistry

Nernst Equation

Calculate the emf of the ce...

CHEMISTRY

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Asked on December 20, 2019 by

Jennifer Wankhade

Calculate the emf of the cell. Zn∣Zn

2+

(0.001M)∣∣Cu

2+

(0.1M)∣Cu

The standard potential of Cu/Cu

2+

half-cell is +0.34 and Zn/Zn

2+

is -0.76 V.

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ANSWER

Given Zn∣Zn

2+

(0.001M)∣∣Cu

2+

(0.1M)∣Cu

Overall cell reaction:

Zn⟶Zn

2+

+2e

Cu

2+

+2e

⟶Cu

Zn+Cu

2+

⟶Zn

2+

+Cu

E

cell

o

=standard reduction potential of cathode + standard oxidation potential of anode

E

cell

o

=0.34 to 0.76 V

E

cell

o

=1.1 V

K

C

=

[Cu

2+

]

[Zn

2+

]

=

10

−1

10

−3

=10

−2

EMF of the cell at any electrode concentration is:

E=E

o

n

0.059

log(K

C

)=1.1−

2

0.059

log(10

−2

)=1.1−

2

0.059

×(2)=1.1−0.059=1.041V

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