A certain half-reaction has a standard reduction potential Ered= +0.40 V. An eng

Question

A certain half-reaction has a standard reduction potential Ered= +0.40 V. An engineer proposes using this half-reaction at the cathode of a galvanic cell that must provide at least 0.90 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? yes, there is a minimum. red 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 no minimum Is there a maximum standard reduction potential that the half-reaction used at the anode of this cell can have? yes, there is a maximum red 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 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

No minimum.   (because E0red of anode must be lessthan E0red of cathode.so that, E0 of anode can be lessthan -0.5 V.)

yes, there is a maximum. E0red = -0.5 v

because, E0cell = E0cathode - E0anode

              0.9 = 0.4 - (x)

                x = -0.5 V

anode, that could be used.

the E0anode, mustbe at least equal to or lessthan -0.5 v.

half-reaction : Zn2+ + 2 e <----> Zn(s) E0= 0.7618 v

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