**Correct Option: A. Filtration** ### Detailed Explanation: **1. Understanding the Techniques:** - **Filtration:** This technique involves passing a mixture through a filter, which allows the liquid to pass through while retaining the solid particles. It is particularly effective for separating insoluble solids from liquids. - **Distillation:** This method is used to separate components of a mixture based on differences in boiling points. It is typically used for separating liquids or for purifying liquids, not for separating solids from liquids. - **Chromatography:** This technique separates components of a mixture based on their movement through a stationary phase, often used for separating different substances in a solution, but not specifically for solid-liquid separation. - **Evaporation:** This process involves heating a liquid to convert it into vapor, leaving behind any dissolved solids. While it can separate solids from liquids, it is not as direct or efficient as filtration for heterogeneous mixtures. **2. Why Filtration is the Best Choice:** - In a heterogeneous mixture, the solid particles are distinct and separate from the liquid. Filtration directly addresses this by using a filter medium (like filter paper) that allows the liquid to flow through while capturing the solid particles. - The process is straightforward: you pour the mixture into a funnel lined with filter paper. The liquid (filtrate) passes through, while the solid (residue) is left behind on the filter paper. This method is quick and effective for separating solids from liquids. **3. Why the Other Options are Incorrect:** - **B. Distillation:** This method is not suitable for separating a solid from a liquid in a heterogeneous mixture because it relies on the boiling point differences of liquids. It is more appropriate for separating liquid mixtures or purifying liquids. - **C. Chromatography:** While effective for separating different substances in a solution, chromatography is not designed for solid-liquid separation in heterogeneous mixtures. It is more complex and requires specific conditions to work effectively. - **D. Evaporation:** Although evaporation can separate a solid from a liquid, it is not the most efficient method for heterogeneous mixtures. It requires heating the liquid, which can lead to loss of the liquid component and is not as immediate as filtration. ### Example Calculation: While there are no calculations needed for this question, it’s important to understand that in practical applications, the size of the filter pores and the size of the solid particles can affect the efficiency of filtration. For example, if the solid particles are too small, they may pass through the filter, which is a common pitfall. ### Revision Summary: - **Filtration** is the most suitable method for separating solids from liquids in heterogeneous mixtures. - **Distillation** is used for separating liquids based on boiling points, not for solid-liquid separation. - **Chromatography** is effective for separating components in solutions but not for solid-liquid mixtures. - **Evaporation** can separate solids from liquids but is less efficient and direct than filtration. By understanding these techniques and their applications, you can effectively choose the right method for separation in various chemical contexts.