Question
Write the cell reactions in lead storage battery during discharge.
✓
Answer
The electrode reaction that occurs during discharge.
At anode
$Pb _{(s)}+ SO _{4(a q)}^{-2} \rightarrow PbSO _{4(s)}+2 e^{-}$
At Cathode
$PbO _{2(s)}+4 H_{(a q)}^{+}+ SO _{4(a q)}^{2-}+2 e^{-} \rightarrow PbSO _{4(s)}+2 H _2 O (l)$
Overall reaction
$Pb _{(s)}+ PbO _{2(s)}+4 H _{(a q)}^{+}+2 SO _{4(a q)}^{-2} \rightarrow 2 PbSO _{4(s)}+2 H _2 O$
At anode
$Pb _{(s)}+ SO _{4(a q)}^{-2} \rightarrow PbSO _{4(s)}+2 e^{-}$
At Cathode
$PbO _{2(s)}+4 H_{(a q)}^{+}+ SO _{4(a q)}^{2-}+2 e^{-} \rightarrow PbSO _{4(s)}+2 H _2 O (l)$
Overall reaction
$Pb _{(s)}+ PbO _{2(s)}+4 H _{(a q)}^{+}+2 SO _{4(a q)}^{-2} \rightarrow 2 PbSO _{4(s)}+2 H _2 O$
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