**Correct Option: C. Evaporation** ### Explanation of the Correct Answer Evaporation is the best technique for separating a soluble solid from a liquid in a homogeneous mixture. Here’s a step-by-step breakdown of why this is the case: 1. **Understanding the Mixture**: In a homogeneous mixture, the components are uniformly distributed. For example, if you have salt dissolved in water, the salt (soluble solid) is evenly mixed with the water (liquid). 2. **Nature of Evaporation**: Evaporation is a process where the liquid phase of a mixture is converted into vapor, leaving behind any dissolved solids. When you heat the mixture, the water will begin to evaporate, and as it does, the concentration of the dissolved solid (salt) increases until all the water has evaporated, leaving the solid behind. 3. **Practical Application**: In a laboratory or practical setting, you would typically heat the solution in a dish. As the water evaporates, you can observe the solid forming at the bottom of the dish. This method is efficient for separating a soluble solid from a liquid because it directly targets the liquid component. ### Why the Other Options Are Incorrect **A. Filtration**: - **Explanation**: Filtration is a technique used to separate insoluble solids from liquids. It involves passing the mixture through a filter paper, which allows the liquid to pass through while retaining the solid particles. - **Why It's Weaker**: Since the solid in question is soluble, it would not be retained by the filter paper. Therefore, filtration is not suitable for separating a soluble solid from a liquid. **B. Distillation**: - **Explanation**: Distillation is a separation technique that relies on differences in boiling points. It is commonly used to separate liquids from each other or to purify liquids. - **Why It's Weaker**: While distillation could theoretically separate a soluble solid from a liquid by boiling off the liquid, it is more complex and less efficient than evaporation for this specific task. Distillation is better suited for separating components based on their boiling points rather than simply removing a solvent. **D. Chromatography**: - **Explanation**: Chromatography is a technique used to separate mixtures based on the movement of different components through a stationary phase. It is often used for separating colored compounds or complex mixtures. - **Why It's Weaker**: Chromatography is not practical for separating a soluble solid from a liquid in a straightforward manner. It is more suited for analyzing and separating small quantities of substances rather than for bulk separation of a solid from a liquid. ### Summary of Key Points - **Evaporation** is the most effective method for separating a soluble solid from a liquid in a homogeneous mixture. - **Filtration** is ineffective for soluble solids as they pass through the filter. - **Distillation** is more complex and not necessary for this type of separation. - **Chromatography** is used for analyzing mixtures rather than bulk separation. By understanding these techniques and their applications, you can effectively choose the right method for separating components in a mixture.