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12 Dec 2019

The first generation of laptop computers was powered by nickel–cadmium (nicad) batteries, which generated 1.20 V based on the following cell reaction:

Cd(s) + 2 NiO(OH)(s) + 2 H2O(ℓ) → Cd(OH)2(s) + 2 Ni(OH)2(s)

What is the value of ∆Gcell?

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Deanna Hettinger
Deanna HettingerLv2
13 Dec 2019

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Related questions

In some applications nickel–cadmium batteries have been replaced by nickel–zinc batteries. The overall cell reaction for this relatively new battery is

H2O (l) + 2 NiO(OH) (s) + Zn(s) →2 Ni(OH)2(s) + Zn(OH)2(s)

a)What is the cathode half-reaction? (b) What is the anode half-reaction? (c) A single nickel–cadmium cell has a voltage of 1.30 V. Based on the difference in the standard reduction potentials of Cd2+ and Zn2+, what voltage would you estimate a nickel–zinc battery will produce? (d) Would you expect the specific energy density of a nickel–zinc battery to be higher or lower than that of a nickel–cadmium battery?

For a particular battery based on one of the followingreactions, E is expected to remain constant with time untilthe cell reactants are almost completely consumed. Which is theappropriate reaction?

2 NiO(OH)(s) + Cd(s) + 2H2O(l) ? 2 Ni(OH)2(s) +Cd(OH)2(s)
Pb(s) + PbO2(s) +2 H+(aq) + 2HSO4-(aq) ? 2PbSO4(s) + 2 H2O(l)
Zn(s) + Cu2+(aq)? Zn2+(aq) + Cu(s)
Zn(s) + 2 MnO2(s)+ 2 NH4+(aq) ? 2NH3(aq) + Mn2O3(s) +Zn2+(aq) + H2O(l)

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