Ch21_5 - Dry Cell Battery Dry Cell Battery Common dry cell...

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Unformatted text preview: Dry Cell Battery Dry Cell Battery Common dry cell Anode (-) Zn ---> Zn2+ + 2e2eCathode (+) 2 NH4 + + 2e- ---> 2e2 NH 3 + H2 1 Alkaline Battery Alkaline Battery Nearly same reactions as in common dry cell, but under basic conditions. 2 Anode: Zn is reducing agent under basic conditions Cathode: HgO + H2O + 2e- ---> Hg + 2 OH - Mercury Battery Mercury Battery 3 Lead Storage Battery Lead Storage Battery Anode (-) Eo = +0.36 V +0.36 Pb + HSO4- ---> PbSO 4 + H+ + 2e---> 2eCathode (+) Eo = +1.68 V +1.68 PbO2 + HSO4- + 3 H+ + 2eHSO 2e---> PbSO 4 + 2 H2O 4 Ni-Cad Battery Ni-Cad Battery Ni-Cad Anode (-) Cd + 2 OH- ---> Cd(OH)2 + 2e---> Cd(OH) 2eCathode (+) NiO(OH) + H2O + e- ---> Ni(OH)2 + OHNiO(OH) Ni(OH) OH 5 Page 1 ...
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