Using the relationship given in part 1, calculate Ecell if [Cu2+] = 1.453 M and [Cr3+] = 0.00176 M, assuming that the temperature remains at 25°C. Give your answer to two places after the decimal.

Question

Ann Boyd

Chemistry

6 January, 13:04

Using the relationship given in part 1, calculate Ecell if [Cu2+] = 1.453 M and [Cr3+] = 0.00176 M, assuming that the temperature remains at 25°C. Give your answer to two places after the decimal.

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Answers (1)

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Harley Walton · Answer 1

1.05 V

Explanation:

Now recall Nernst equation;

Ecell = E°cell - 0.0592/n log [Red]/[Ox]

Now we look at the values of E°cathode and E°anode

E°cathode = 0.34 V

E°anode = - 0.74 V

E°cell = 0.34 - (-0.74)

E°cell = 1.08 V

[Red] = 1.453 M

[Ox] = 0.00176 M

n = 6

Ecell = E°cell - 0.0592/n log [Red]/[Ox]

Ecell = 1.08 - 0.0592/6 * log[1.453]/[0.00176]

Ecell = 1.08 - 0.0592/6 * 2.917

Ecell = 1.08 - 0.02878

Ecell = 1.05 V