Write a balanced equation for the overall cell reaction when a lead storage battery is being charged. Refer to Section 19.10.

Name: Chemistry
Author: McMurry
ISBN: 9781292336145

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Identify the half-reactions involved in a lead storage battery. During charging, the reactions are reversed compared to discharging. The discharging reactions are: \( \text{Pb} + \text{PbO}_2 + 2\text{H}_2\text{SO}_4 \rightarrow 2\text{PbSO}_4 + 2\text{H}_2\text{O} \).

Reverse the discharging reactions to represent the charging process. The half-reactions for charging are: \( \text{PbSO}_4 + 2\text{e}^- + 2\text{H}^+ \rightarrow \text{Pb} + \text{H}_2\text{SO}_4 \) and \( \text{PbSO}_4 + 2\text{H}_2\text{O} \rightarrow \text{PbO}_2 + 4\text{H}^+ + 2\text{e}^- + \text{SO}_4^{2-} \).

Balance the electrons in the half-reactions. Ensure that the number of electrons lost in the oxidation half-reaction equals the number of electrons gained in the reduction half-reaction.

Combine the balanced half-reactions to form the overall balanced equation for the charging process. This involves adding the two half-reactions together and canceling out the electrons and any other species that appear on both sides of the equation.

Verify that the final equation is balanced in terms of both mass and charge. Check that the number of each type of atom and the total charge are the same on both sides of the equation.

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Redox Reactions

Redox reactions involve the transfer of electrons between two species, resulting in oxidation (loss of electrons) and reduction (gain of electrons). In the context of a lead storage battery, the charging process is a redox reaction where lead sulfate is converted back to lead and lead dioxide, facilitating the storage of electrical energy.

Electrochemical Cells

Electrochemical cells convert chemical energy into electrical energy through redox reactions. A lead storage battery is a type of electrochemical cell that operates in two half-cells, where oxidation occurs at the anode and reduction at the cathode. Understanding the structure and function of these cells is essential for writing balanced equations for their reactions.

Balancing Chemical Equations

Balancing chemical equations ensures that the number of atoms for each element is the same on both sides of the equation, adhering to the law of conservation of mass. In the case of the lead storage battery, balancing the equation involves accounting for all reactants and products, including lead, lead dioxide, and sulfuric acid, to accurately represent the overall cell reaction during charging.

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