Question

Picking a reduction or calidation that will make a galvanic cell work A certain half-reaction has a standard reduction potential E -+0.76 V. An engineer proposes using this half-reaction at the anode of a galvanic cell that must provide at least 1.30 V of electrical power. The cell will operate under standard conditions. Note for advanced students: assume the engineer requires this half-reaction to happen at the anode of the cell. Is there a minimum standard reduction potential that the half reaction used at the cathode of this cell can have? O yes, there is a minimum. - Ov If so, check the "yes" box and calculate the minimum. Round your answer to 2 decimal places. If there is no lower imit, check the "no" box no minimum x 5 ? Is there a maximum standard reduction potential that the half-reaction used at the cathode of this cell can have? yes, there is a maximum. - Oy If so, check the "yes" box and calculate the maximum. Round your answer to 2 decimal places. If there is no upper limit, check the "no" box no maximum By using the information in the ALEKS Datatab, write a balanced equation describing a half reaction that could be used at the cathede of this cell. Note: write the half reaction as it would actually occur at the cathode Explanation

Answer 1

Required E° cell = 1.30 V or more

E°_red for anode = +0.76 V

Now, E° cell = E°_{red (cathode)} - E°_{red (anode)}

1.30 V = E°_{red (cathode)} - (+0.76 V)

E°_{red (cathode)} = 1.30 V + 0.76 V

= 2.10 V

If value is less than 2.10 V, E°_cell will be less than required value i.e. 1.30 V.

So, there must be minimum 2.10 V as E°_{red (cathode)} .

Based on above, the answers are

Answer 1

Yes, there is a minimum.

Minimum value is E°_red = 2.10 V

Answer 2

No, there is no maximum.

Answer 3

One of the possible cathode is F₂ (g). Its E°_red = 2.87

Half reaction:

F₂ (g) + 2e^- ------> 2F^- (aq)