The correct option for separating a liquid mixture based on differences in boiling points is **B. Distillation**. ### Detailed Explanation **What is Distillation?** Distillation is a separation technique that exploits differences in boiling points of components in a liquid mixture. When a mixture is heated, the component with the lower boiling point vaporizes first. This vapor can then be cooled and condensed back into a liquid, effectively separating it from the other components in the mixture. **How Distillation Works:** 1. **Heating the Mixture:** The liquid mixture is placed in a distillation flask and heated. As the temperature rises, the component with the lowest boiling point begins to vaporize. 2. **Vaporization:** The vapor rises through a column (often called a distillation column) and enters a condenser. 3. **Condensation:** In the condenser, the vapor is cooled, usually by passing it through a tube surrounded by cold water. As it cools, it condenses back into a liquid. 4. **Collection:** The condensed liquid, known as the distillate, is collected in a separate container. The remaining liquid in the distillation flask contains the components with higher boiling points. **Why is Distillation the Correct Answer?** - **Boiling Point Differences:** Distillation is specifically designed to separate components based on their boiling points. If the boiling points of the components in the mixture are significantly different (typically at least 25-30 °C apart), distillation is highly effective. - **Common Applications:** Distillation is widely used in industries for purifying liquids, such as in the production of alcoholic beverages, petroleum refining, and the separation of essential oils. ### Why the Other Options are Incorrect **A. Filtration:** - **Process:** Filtration is a technique used to separate solids from liquids or gases using a filter medium that allows only the fluid to pass through. - **Limitation:** It does not separate components based on boiling points; rather, it is effective for separating insoluble solids from liquids. Therefore, it is not suitable for separating liquid mixtures. **C. Chromatography:** - **Process:** Chromatography is a technique used to separate components of a mixture based on their different affinities for a stationary phase and a mobile phase. - **Limitation:** While it can separate components in a liquid mixture, it does not specifically rely on boiling points. It is more suited for separating complex mixtures, such as pigments or pharmaceuticals, rather than simple liquid mixtures based on boiling points. **D. Centrifugation:** - **Process:** Centrifugation involves spinning a mixture at high speeds to separate components based on their density. - **Limitation:** This technique is effective for separating solids from liquids or separating liquids of different densities, but it does not utilize boiling points for separation. It is not appropriate for separating liquid mixtures based on boiling points. ### Summary - **Distillation** is the most appropriate method for separating liquid mixtures based on differences in boiling points. - It works by heating the mixture, allowing the component with the lower boiling point to vaporize and then condense it back into a liquid. - Other methods like filtration, chromatography, and centrifugation do not effectively separate components based on boiling points. ### Revision Summary - **Distillation** separates liquids based on boiling points. - The process involves heating, vaporization, condensation, and collection. - Other methods (filtration, chromatography, centrifugation) are not suitable for boiling point separation. - Effective for mixtures with significant boiling point differences (≥ 25-30 °C).