(a)
Interpretation: The composition of anode, cathode, and electrolyte in a fully charged lead storage battery needs to be explained.
Concept Introduction: In an
In oxidation, the loss of electrons takes place by an element and its oxidation state increases Similarly in reduction, the gain of electrons takes place by an element. Here, the oxidation state of the element decreases.
(a)
Explanation of Solution
In a fully charged lead storage battery, oxidation of lead at the anode takes place. Here, the electrolyte is dilute sulphuric acid. The lead ions formed at the anode in the presence of sulfate ions (from sulphuric acid). Thus, the insoluble lead sulfate is formed. Here, the flow of electrons takes place from the anode to reduce lead dioxide at the cathode. Here, also lead ions formed react with aqueous sulfate ions to form insoluble lead sulfate.
The two half-reactions for lead storage battery are as follows:
Anode-Oxidation takes place:
Since sulfuric acid is an electrolyte the overall anode reaction will be:
Cathode-Reduction takes place:
Since sulfuric acid is an electrolyte the overall cathode reaction will be:
(b)
Interpretation: The composition of the anode, cathode, and electrolyte in a fully discharged lead storage battery needs to be explained.
Concept Introduction: In an electrochemical process, a redox reaction takes place. Here, two half-reactions occur where in one reaction oxidation takes place and in the other reaction, reduction takes place. The sum of these two-half reactions gives the overall reaction for the process.
In oxidation, the loss of electrons takes place by an element and its oxidation state increases Similarly in reduction, the gain of electrons takes place by an element. Here, the oxidation state of the element decreases.
(b)
Explanation of Solution
In a fully discharged lead storage battery, the anode and cathode get reversed.
The two half-reactions will be as follows:
Anode-Oxidation takes place:
Cathode-Reduction takes place:
Thus, in a fully discharged lead storage battery, the anode is composed of
Chapter 21 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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