A certain half-reaction has a standard reduction potential E^degree_red = +1.24

Question

A certain half-reaction has a standard reduction potential E^degree_red = +1.24 V . An engineer proposes using this half-reaction at the cathode of a galvanic cell that must provide at least 1.40 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 cathode of the cell. Is there a minimum standard reduction potential that the half-reaction used at the anode of this cell can have? If so, check the "yes" box and calculate the minimum. Round your answer to 2 decimal places. If there is no lower limit, check the "no" box. Is there a maximum standard reduction potential that the half-reaction used at the anode of this cell can have? 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. By using the information in the ALEKS Data tab, write a balanced equation describing a half reaction that could be used at the anode of this cell. Note: write the half reaction as it would actually occur at the anode.

Explanation / Answer

The EMF:

EMF = Ecathode - Eanode

EMF = 1.40 at least

A)

minimum standard reduction for this... if we use it as anode:

if we use it as anode, then

Eanode = -1.24 V

1.40 = Ecathode - 1.24

Ecathode = 1.40 + 1.24 = 2.64 V

when we select the cathode, then we will need to have AT LEAST 2.64 V

b)

There is no maximum, since we only require to get to the 1.40 V treshold

if we increase, i.e. 3.0 V; we will have EMF > 1.40

C)

Possible examples are:

F2(g) + 2 e 2 F +2.87

Meaning that we need a VERY high potential

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