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Ch.18 - Aqueous Ionic Equilibrium
Tro - Chemistry: A Molecular Approach 6th Edition
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217Not the one you use?Change textbook
All textbooksTro 6th EditionCh.18 - Aqueous Ionic EquilibriumProblem 105c
Chapter 18, Problem 105c

Determine if each compound is more soluble in acidic solution than it is in pure water. Explain. a. BaCO3 b. CuS c. AgCl d. PbI2

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1
Identify the compound in question: AgCl (Silver Chloride).
Recall the solubility product constant (Ksp) for AgCl, which is a measure of its solubility in water.
Consider the dissolution reaction of AgCl in water: \[ \text{AgCl(s)} \rightleftharpoons \text{Ag}^+(aq) + \text{Cl}^-(aq) \]
Determine if the anion (Cl⁻) can react with H⁺ ions in an acidic solution. Since Cl⁻ is the conjugate base of a strong acid (HCl), it does not react with H⁺ ions.
Conclude that since Cl⁻ does not react with H⁺, the solubility of AgCl is not increased in an acidic solution compared to pure water.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Solubility Product Constant (Ksp)

The solubility product constant (Ksp) is an equilibrium constant that applies to the solubility of sparingly soluble ionic compounds. It quantifies the extent to which a compound can dissolve in water, represented by the product of the molar concentrations of its ions, each raised to the power of their coefficients in the balanced equation. For AgCl, Ksp helps determine how its solubility changes in different conditions, such as acidic solutions.
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Common Ion Effect

The common ion effect refers to the decrease in solubility of an ionic compound when a common ion is added to the solution. In the case of AgCl, the presence of Ag+ ions from another source can shift the dissolution equilibrium, reducing the solubility of AgCl. Understanding this effect is crucial for predicting how the solubility of AgCl will change in acidic solutions where other ions may be present.
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Acid-Base Chemistry

Acid-base chemistry involves the study of proton transfer reactions and the behavior of acids and bases in solution. In acidic solutions, the concentration of H+ ions increases, which can affect the solubility of certain salts. For AgCl, the addition of H+ ions can lead to the formation of soluble complexes, potentially increasing its solubility compared to pure water, making it essential to consider acid-base interactions when analyzing solubility.
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