Question
Write note on lead storage cell.
✓
Answer
$\rightarrow $ In consists of a lead anode and a grid of lead packed with lead dioxide $\left( PbO _2\right)$ as cathode.
$\rightarrow $ A $38\%$ solution of sulphuric acid is used as an electrolyte.
\rightarrow The cell reactions when the battery is in use are given below :
Anode : $Pb ( s )+ SO _4^{2-}( aq ) \rightarrow PbSO _4(s)+2 e ^{-}$
Cathode : $PbO _2(s)+ SO _4{ }^{2-}( aq )+4 H ^{+}( aq )+2 e ^{-}$
$\rightarrow PbSO _4(s)+2 H _2 O (l)$
$\rightarrow$ Overall cell reaction consisting of cathode and anode reactions is :
$Pb ( s )+ PbO _2(s)+2 H _2+ SO _4( aq ) \rightarrow 2 PbSO _4(s)$
$+2 H _2 O (l)$
$\rightarrow$ On charging the battery, the reaction is reversed and $PbSO _4(s)$ on the anode and cathode is converted into Pb and $PbO _2$, respectively.
$\rightarrow $ A $38\%$ solution of sulphuric acid is used as an electrolyte.
\rightarrow The cell reactions when the battery is in use are given below :
Anode : $Pb ( s )+ SO _4^{2-}( aq ) \rightarrow PbSO _4(s)+2 e ^{-}$
Cathode : $PbO _2(s)+ SO _4{ }^{2-}( aq )+4 H ^{+}( aq )+2 e ^{-}$
$\rightarrow PbSO _4(s)+2 H _2 O (l)$
$\rightarrow$ Overall cell reaction consisting of cathode and anode reactions is :
$Pb ( s )+ PbO _2(s)+2 H _2+ SO _4( aq ) \rightarrow 2 PbSO _4(s)$
$+2 H _2 O (l)$
$\rightarrow$ On charging the battery, the reaction is reversed and $PbSO _4(s)$ on the anode and cathode is converted into Pb and $PbO _2$, respectively.
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