Write note on lead storage cell. - Vidyadip

Question

Write note on lead storage cell.

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Answer

→ In consists of a lead anode and a grid of lead packed with lead dioxide $\left( PbO _2\right)$ as cathode.
→ A 38% solution of sulphuric acid is used as an electrolyte.

→ 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)
$
→ Overall cell reaction consisting of cathode and anode reactions is :
$
\begin{array}{l}
Pb ( s )+ PbO _2(s)+2 H _2+ SO _4( aq ) \rightarrow 2 PbSO _4(s) \\
+2 H _2 O (l) \\
\end{array}
$
→ 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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