The measured voltage at standard conditions, 25 degree C and concentrations of 1

Question

The measured voltage at standard conditions, 25 degree C and concentrations of 1.0 M for the aqueous ions of the reduction half-reaction is defined as the standard reduction potential, E compositefunction. The more positive (or less negative) the reduction potential, the greater is the tendency for the reduction to occur. Furthermore, the more positive (or less negative) E compositefunction, the greater tendency to be oxidized. Using Table 9-1, list 5 metals below based on increasing E compositefunction values: Using metals in question 3, show the balanced equation between the two metals that would give the largest E compositefunction cell reading, and identify the half-reaction for anode and cathode. a. Balanced equation: b. Anode half-reaction: c. Cathode half-reaction:

Explanation / Answer

From the given elements

Li has less reduction potential and Co has more reduction potential

Standard reduction potential of Li is = -3.05 V Thus it will act as anode

For monoelectronic reduction of Co3+ reduction potential is 1.81 V. It will act as cathode

The reduction potential of Co2+ to Co is -0.28 V

Since we are calculating the maximum potential, we can neglect further reductions. (since it is -ve)_

Maximum voltage obtained from the cell is = E cathode-E anode = 1.81 -(-3.05) = 4.86 V

Balanced equation is

a). Li + Co3+ gives Li+ + Co2+ (Further reductions are not considered. Since it will not yield the maximum value)

b). Anode reaction

Li   gives Li+ + e

c) cathode reaction

  Co3+ + e gives Li+ + Co2+  

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