The correct option is **C. Hydrolysis**. ### Detailed Explanation: **What is Hydrolysis?** Hydrolysis is a chemical reaction in which water (H₂O) is used to break down a compound. In the context of salts, hydrolysis occurs when a salt reacts with water to produce an acid or a base. This process is particularly important in understanding how salts behave in aqueous solutions. **How Hydrolysis Works:** 1. **Dissociation of Salt:** When a salt dissolves in water, it dissociates into its constituent ions. For example, sodium chloride (NaCl) dissociates into Na⁺ and Cl⁻ ions. 2. **Reaction with Water:** Depending on the nature of the ions produced, one of these ions may react with water. For instance: - If the salt is derived from a strong acid and a weak base (like NH₄Cl), the cation (NH₄⁺) can react with water to produce H⁺ ions, making the solution acidic: \[ NH_4^+ + H_2O \rightleftharpoons NH_3 + H_3O^+ \] - Conversely, if the salt is from a weak acid and a strong base (like NaCH₃COO), the anion (CH₃COO⁻) can react with water to produce OH⁻ ions, making the solution basic: \[ CH_3COO^- + H_2O \rightleftharpoons CH_3COOH + OH^- \] 3. **Resulting pH Change:** The resulting solution can be either acidic or basic depending on the nature of the ions involved in the hydrolysis. ### Why Other Options Are Incorrect: - **A. Neutral Process:** This option suggests that the reaction does not change the pH of the solution. However, hydrolysis often results in a change in pH, making the solution either acidic or basic. Therefore, it is not a neutral process. - **B. Basic Acidic Process:** This term is somewhat contradictory. A process cannot be both basic and acidic simultaneously. Hydrolysis specifically leads to either an acidic or a basic solution, not both at the same time. Thus, this option is vague and misleading. - **D. Sublimation:** Sublimation is the process where a solid changes directly into a gas without passing through the liquid phase (e.g., dry ice turning into carbon dioxide gas). This process is unrelated to the reaction of salts with water and does not involve the formation of acids or bases. Therefore, it is not applicable in this context. ### Common Pitfalls: - **Confusing Hydrolysis with Neutralization:** Hydrolysis is not the same as neutralization, which is the reaction between an acid and a base to form water and a salt. Hydrolysis specifically involves the reaction of water with a salt. - **Overlooking the Nature of Ions:** Students may forget that the behavior of the resulting solution (acidic or basic) depends on whether the ions from the salt are derived from strong or weak acids/bases. ### Revision Summary: - Hydrolysis is the reaction of a salt with water to form an acid or a base. - The resulting solution can be acidic or basic depending on the ions produced. - It is not a neutral process, nor is it related to sublimation. - Understanding the nature of the ions involved is crucial for predicting the outcome of hydrolysis.