Ch.18 - ElectrochemistryWorksheetSee all chapters
All Chapters
Ch.1 - Intro to General Chemistry
Ch.2 - Atoms & Elements
Ch.3 - Chemical Reactions
BONUS: Lab Techniques and Procedures
BONUS: Mathematical Operations and Functions
Ch.4 - Chemical Quantities & Aqueous Reactions
Ch.5 - Gases
Ch.6 - Thermochemistry
Ch.7 - Quantum Mechanics
Ch.8 - Periodic Properties of the Elements
Ch.9 - Bonding & Molecular Structure
Ch.10 - Molecular Shapes & Valence Bond Theory
Ch.11 - Liquids, Solids & Intermolecular Forces
Ch.12 - Solutions
Ch.13 - Chemical Kinetics
Ch.14 - Chemical Equilibrium
Ch.15 - Acid and Base Equilibrium
Ch.16 - Aqueous Equilibrium
Ch. 17 - Chemical Thermodynamics
Ch.18 - Electrochemistry
Ch.19 - Nuclear Chemistry
Ch.20 - Organic Chemistry
Ch.22 - Chemistry of the Nonmetals
Ch.23 - Transition Metals and Coordination Compounds

Solution: The cell diagram for the lead-acid cell that is used in automobile and truck batteries isPb(s) l PbSO4 (s) l H2SO4 (aq) l PbO2(s), PbSO4(s) l Pb (s)where the comma between PbO2 (s) and PbSO4 (s) denot

Solution: The cell diagram for the lead-acid cell that is used in automobile and truck batteries isPb(s) l PbSO4 (s) l H2SO4 (aq) l PbO2(s), PbSO4(s) l Pb (s)where the comma between PbO2 (s) and PbSO4 (s) denot

Problem

The cell diagram for the lead-acid cell that is used in automobile and truck batteries is

Pb(s) l PbSO4 (s) l H2SO4 (aq) l PbO2(s), PbSO4(s) l Pb (s)

where the comma between PbO2 (s) and PbSO4 (s) denotes a heterogeneous mixture of the two solids and the right-hand lead electrode is nonreactive.

a, Write a balanced equation for the net cell reaction:

b. Look up standard potentials for the oxidation and the reduction reactions, then calculate the value of E°cell.

c. Calculate the value of ΔG°rxn

d. Calculate the value of Ecell at 25°C is [H2SO4] = 10.0M

e. How many lead-acid cells are in a 12 V car battery? Round to the nearest integer.

Solution

The cell diagram of the process is:

Pb(s) l PbSO4(s) l H2SO4(aq) l PbO2(s), PbSO4(s) l Pb(s) (nonreactive)

Where

The left-hand Pb(s) is one plate

PbSO4(s) is a solid in the left-hand plate

H2SO4(aq) is the electrolyte

PbO2(s), PbSO4(s) is a mixture of solids covering the right-hand plate

Pb(s) is the non-reactive right-hand plate


Because the right-hand cell is covered in a mixture (and hence, is non-reactive), we consider PbO2(s) as the right-hand plate.


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