Question

Enter electrons as e A voltaic cell is constructed from a standard Hg Hg half cell (Ered 0.855V) and a standard F2 F half cell (Ered 2.870V). (Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (ag) or (s). If a box is not needed, leave it blank.) The anode reaction is: The cathode reaction is: The spontaneous cell reaction is: The cell voltage is V

Answer 1

1)

a)

Oxidation takes place on Anode.

The one with smaller Eo value will be oxidised.

So, the anode reaction is:

Hg(l) —> Hg2+(aq) + 2 e-

b)

Reduction takes place on Cathode.

The one with greater Eo value will be reduced.

So, the Cathode reaction is:

F2(g) + 2 e- —> 2F-(aq)

C)

Overall reaction is:

Hg(l) + F2(g) —> Hg2+(aq) + 2F-(aq)

d)

Eo cell = Eo cathode - Eo anode

= 2.870 V - 0.855 V

= 2.015 V

Answer: 2.015 V