write cell reaction which occur in Lead Storage battery number first when battery is in use number second when the battery is on charging write short answer of I marks each part
Answers
Answer:
Oxidation reaction at anode:
Pb
(s)
→Pb
(aq)
2+
+2e
−
(oxidation)
Pb
(aq)
2+
+SO
4
(aq)
2−
→PbSO
4(s)
(precipitation)
Pb
(s)
+SO
4
(aq)
2−
→PbSO
4(s)
+2e
−
(Overall reaction at anode during discharge)
Reduction reaction at cathode:
PbO
2(s)
+4H
(aq)
+
+2e
−
→Pb
(aq)
2+
+2H
2
O (reduction)
Pb
(aq)
2+
+SO
4(aq)
2−
→PbSO
4(s)
(precipitation)
PbO
2(s)
+4H
(aq)
+
+SO
4
(aq)
2−
+2e
−
→PbSO
4(s)
+2H
2
O
(l)
(Overall reaction at cathode during discharge)
The overall cell reaction during discharging is:
Pb
(s)
+SO
4
(aq)
2−
→PbSO
4(s)
+2e
−
PbO
2(s)
+H
(aq)
+
+SO
4
(aq)
2−
+2e
−
→PbSO
4(s)
+2H
2
O
(l)
Pb
(s)
+PbO
2(g)
+2H
2
SO
4(aq)
→2PbSO
4(s)
+2H
2
O
(l)
Explanation: