The correct option is **C. Volume of the solvent**. ### Detailed Explanation To understand why the volume of the solvent does not typically affect the solubility of a substance, we need to explore the factors that influence solubility in detail. 1. **Temperature of the Solvent (Option A)**: - **Effect on Solubility**: For most solid solutes, increasing the temperature of the solvent increases solubility. This is because higher temperatures provide more kinetic energy to the molecules, allowing them to break apart and dissolve more easily. However, for gases, solubility typically decreases with increasing temperature. - **Conclusion**: Temperature is a significant factor affecting solubility. 2. **Pressure Applied to the Solution (Option B)**: - **Effect on Solubility**: Pressure has a notable effect on the solubility of gases. According to Henry's Law, the solubility of a gas in a liquid is directly proportional to the pressure of that gas above the liquid. Increasing the pressure increases the solubility of the gas. However, pressure has little to no effect on the solubility of solids and liquids. - **Conclusion**: Pressure is an important factor, especially for gases. 3. **Volume of the Solvent (Option C)**: - **Effect on Solubility**: The volume of the solvent does not inherently change the solubility of a solute. Solubility is defined as the maximum amount of solute that can dissolve in a given amount of solvent at a specific temperature and pressure. While increasing the volume of the solvent allows for more solute to be dissolved (because there is more space for it), it does not change the solubility limit of the solute itself. For example, if a solute has a solubility of 10 g per 100 mL of water, this remains constant regardless of whether you have 100 mL or 1 L of water. - **Conclusion**: The volume of the solvent does not affect the solubility of a substance. 4. **Nature of the Solute and Solvent (Option D)**: - **Effect on Solubility**: The chemical nature of both the solute and solvent plays a crucial role in solubility. Polar solutes tend to dissolve well in polar solvents (like salt in water), while non-polar solutes dissolve better in non-polar solvents (like oil in hexane). This is often summarized by the phrase "like dissolves like." - **Conclusion**: The nature of the solute and solvent is a critical factor affecting solubility. ### Summary of Incorrect Options - **Option A (Temperature of the solvent)**: Affects solubility significantly, especially for solids and gases. - **Option B (Pressure applied to the solution)**: Affects the solubility of gases significantly, but has little effect on solids and liquids. - **Option D (Nature of the solute and solvent)**: A fundamental factor that determines how well a solute will dissolve in a solvent. ### Common Pitfalls - Confusing the effect of volume with solubility limits: Remember that while increasing the volume allows for more solute to be dissolved, it does not change the solubility itself. - Overlooking the specific conditions under which gases behave differently than solids and liquids regarding pressure and temperature. ### Revision Summary - **Temperature**: Affects solubility; generally increases for solids, decreases for gases. - **Pressure**: Affects gas solubility significantly; minimal effect on solids and liquids. - **Volume**: Does not affect solubility limits; allows for more solute to be dissolved. - **Nature of solute/solvent**: Critical for determining solubility; "like dissolves like."