(a) What type of a battery is the lead storage battery? Write the anode and the cathode reactions and the overall reaction occuring in a lead storage battery when current is drawn from it. (b) In the button cell, widely used in watches, the following reactions takes place: Zn(s)+Ag_2O(s)+H_2O(l) to Zn^(2+) (aq)+2OH^(-) (aq) Determine E^@ and Delta G^@ for the reaction:

(a) What type of a battery is the lead storage battery? Write the anod

1.	(a) What type of a battery is the lead storage battery? Write the anode and the cathode reactions and the overall reaction occuring in a lead storage battery when current is drawn from it. (b) In the button cell, widely used in watches, the following reactions takes place: Zn(s)+Ag_2O(s)+H_2O(l) to Zn^(2+) (aq)+2OH^(-) (aq) Determine E^@ and Delta G^@ for the reaction:
Answer» Solution :(a) It is secondary cell ANODE reaction: `Pb+SO_4^(2-) to PbSO_4(s)+2e^(-)` `Cathode reaction: PbO_2+4H^+ +SO_(4)^(-) +2e to PbSO_+2H_2O` `Net reaction: Pb+PbO_2+2H_2SO_4 to 2PbSO_4+2H_2O` (b) `E_(cell)^@=E_(cathode)^@-E_(anode)^@ ` =0.80V-(-0.76)V =+1.56 V `Delta RG^@=-nFE_(cell)^@` `=-2 times 96500 C mol^-1 times 1.56 V` `=-301080 J mol^-1` or `-301.08KJ mol^-1`