Question

Enter electrons as e Use smallest possible integer coefficients. If a box is not needed, leave it blank. A voltaic cell is constructed from a standard Hg? Hg half cell (Ered=0.855V) and a standard Pb2Pb half cell (E®red = -0.126V). The anode reaction is The cathode reaction is: The spontaneous cell reaction is: The cell voltage is

Answer 1

1)

a)

Oxidation takes place on Anode.

The one with smaller Eo value will be oxidised.

So, the anode reaction is:

Pb(s) —> Pb2+(aq) + 2 e-

b)

Reduction takes place on Cathode.

The one with greater Eo value will be reduced.

So, the Cathode reaction is:

Hg2+(aq) + 2 e- —> Hg(l)

C)

Overall reaction is:

Hg2+(aq) + Pb(s) —> Hg(l) + Pb2+(aq)

d)

Eo cell = Eo cathode - Eo anode

= 0.855 V - (-0.126 V)

= 0.981 V

Answer: 0.981 V

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