Question

# A voltaic cell that uses the reaction Tl3+(aq)+2Cr2+(aq)→Tl+(aq)+2Cr3+(aq) has a measured standard cell potential of +1.19...

A voltaic cell that uses the reaction
Tl3+(aq)+2Cr2+(aq)→Tl+(aq)+2Cr3+(aq)
has a measured standard cell potential of +1.19 V.

Part A

Write the two half-cell reactions.

Part B

Part C

By using data from Appendix E, determine E∘red for the reduction of Tl3+(aq) to Tl+(aq).

Sketch the voltaic cell, label the anode and cathode, and indicate the direction of electron flow.

Drag the labels to the appropriate targets. (anions, cations, anode, cathode, e- down, e-upwards to the right)

Sol :-

Part.A.

Half cell reactions:

At Anode (oxidation) :    Cr2+ (aq) ----------->  Cr3+ (aq) + e-

At cathode (reduction) : Tl3+(aq) + 2e- ------------>  Tl+(aq)

Part.B :-

From standard reduction table we get, E0Cr3+/Cr2+ = -0.42 V

E0cell = +1.19 V

We know, E0cell = E0cathode - E0anode

So, E0cell = +1.19 V = E0Tl3+/Tl+ - E0Cr3+/Cr2+ = E0Tl3+/Tl+ - (-0.42 V)

E0Tl3+/Tl+ = 1.19-0.42 = 0.77 V

Part.C :-

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