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(a) What type of a cell is the lead stor...

(a) What type of a cell is the lead storage battery ? Write the anode and the cathode reactions and the overall reaction reaction occuring in a lead storage battery while operating .
(b) A voltaic cell is set up at `25^(@)C` with the half-cells , `Al|Al^(3+) (0.001M)` and `Ni| Ni^(2+) (0.50 M)`. Write the equation for the reaction that occurs when the cell generates an elastric current and determine the cell potential.
(Given : `E_(Ni^(2+)|Ni)^(@) = -0.25 V , E_(Al^(3+)|Al)^(@) = -1.66V`).

Text Solution

Verified by Experts

The lead storage battery is most important secondary cell. The celi reactions when the battery is in use -
At anode : `Pb(s) +SO_4^(2-)(aq) toPbSO_4(s) +2e^-`
At Cathode :`PbO_2(s) +SO_4^(2-)(aq)+2e^(-)toPbSO_4(s) +2H_2O(l)`
The overall cell reaction is
`Pb(s) +PbO_2(s) +2H_2SO_4(aq)to2PbSO_4(s) +2H_2O(l)`
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