Question

A strip of chromium is placed in a 1 M solution of chromium (III) sulfate, and...

A strip of chromium is placed in a 1 M solution of chromium (III) sulfate, and a strip of copper is placed in a 1 M solution of copper(II) chloride. The two solutions are connected with a salt bridge, and the two metals are connected by a wire. bridge, and the two metals are connected by a wire.

Reduction Half-Reaction                            E° (V)

Cr3+(aq)+3e–⇌Cr(s)                                   –0.74

Cu2+(aq)+2e– ⇌Cu(s)                                  0.34

Which of the following takes place?

a. Sulfur deposits at the iron electrode.

b. The Cr(III) concentration of the iron half-cell decreases.

c. Copper atoms deposit at the cathode.

d. Chlorine is produced at the copper electrode.

e. Chlorine is produced at the chromium electrode.

Homework Answers

Answer #1

Answer 'C'

The standard reduction potentials are

Cr3+(aq)+3e⇌Cr(s)                                E0=   –0.74V

Cu2+(aq)+2e– ⇌Cu(s)                             E0 =    0.34V

Copper acts as cathode as it has positive E0

Reduction takes place at cathode (Copper deposited at cathode)

Cu2+(aq)+2e– ⇌Cu(s)       -------------(1)

Oxidation takes place at anode

Cr(s)  ⇌ Cr3+(aq)+3e–          ------------ (2)

The net balanced cell reaction (1) x 3 + (2)x 2 ===>

3 Cu2+ + 2 Cr ⇌ 3 Cu + 2 Cr3+

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