Name: All About Chemical Kinetics
Uploaded: 2019-07-19
Duration: 9 min 10 s
Description: Chemical kinetics is also called reaction kinetics. In this video, we will understand the rates of chemical reactions and the order of reactions.

Question

Write the chemistry of recharging the lead storage battery, highlighting all the materials that are involved during recharging.

Accepted Answer

A lead storage battery consists of a lead anode, a grid of lead packed with lead oxide $(P b O_{2})$ as the cathode and a $38 %$ solution of sulphuric acid $(H_{2} S O_{4})$ as an electrolyte.
Battery is in use, the cell reactions occur
At anode: $P b (s) + S O_{4}^{2 -} (a q) ⟶ P b S O_{4} (s) + 2 e^{-}$
At cathode: $P b (s) + S O_{4}^{2 -} (a q) + 4 H_{}^{+} (a q) + 2 e^{-} ⟶ P b S O_{4} (s) + 2 H_{2} O (l)$
The overall cell reaction is given by,
$P b (s) + P b O_{2} (s) + 2 H_{2} S O_{4} (a q) ⟶ 2 P b S O_{4} (s) + 2 H_{2} O (l)$

Battery is charged, the reverse of all the reactions occur
At anode: $P b S O_{4} (s) + 2 e^{-} ⟶ P b (s) + S O_{4}^{2 -} (a q)$
At cathode: $P b S O_{4} (s) + 2 H_{2} O \to P b O_{2} (s) + S O_{4}^{2 -} (a q)$
Overall Reaction $P b S O_{4} (s) + 2 H_{2} O ⟶ P b (s) + P b O_{2} (s)$
Therefore, on charging, $P b S O_{4} (s)$ at the anode and at cathode converted to $P b (s)$ and $P b O_{2} (s)$ .

Telangana Board Solutions for Chapter: Electrochemistry and Chemical Kinetics, Exercise 5: Intext Questions

Telangana Board Chemistry Solutions for Exercise - Telangana Board Solutions for Chapter: Electrochemistry and Chemical Kinetics, Exercise 5: Intext Questions

Questions from Telangana Board Solutions for Chapter: Electrochemistry and Chemical Kinetics, Exercise 5: Intext Questions with Hints & Solutions

Learn and Prepare for any exam you want !