First slide

Electrochemical cells

Question

During discharge of a lead storage cell the density of sulphuric acid in the cell

Moderate

A

Increases
B

Decreases
C

remains unchanged
D

initially increases but decreases subsequently

Solution

$Discharge reaction {Pb}_{(s)} + {PbO}_{2 (s)} + 2 H_{2} {SO}_{4} \to 2 {PbSO}_{4} + 2 H_{2} O$

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