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19 Mar 2020
In some applications nickel–cadmium batteries have been replaced by nickel–zinc batteries.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?
In some applications nickel–cadmium batteries have been replaced by nickel–zinc batteries.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?
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Jean KeelingLv2
14 May 2020