in a grade 6 science class a group of pupils would like to separate salt from water what method will they use to separate the mixture? explain
Answer (1)
To separate salt from water, a Grade 6 science class can use the evaporation method. This involves heating the saltwater solution, causing the water to evaporate into a gas (water vapor) and leaving the salt behind as a solid. Here's a more detailed explanation:1. The Setup:A saltwater solution (salt dissolved in water) is placed in a container, like a shallow dish or beaker. 2. Heating:The container is heated, either using a hot plate, Bunsen burner (if available in the classroom), or even by placing it in sunlight. 3. Evaporation:As the water heats up, it reaches its boiling point and begins to evaporate, turning into a gaseous state (water vapor). 4. Separation:The water vapor rises and disperses into the air. The salt, being a solid with a much higher boiling point, remains behind in the container. Why it works: Water and salt have different physical properties, specifically their boiling points. Water boils and evaporates at a lower temperature than salt. This allows for the separation of the two substances through evaporation. Important Considerations:Safety:Adult supervision is important when heating any solution, especially if using a heat source like a Bunsen burner. Speed:Evaporation can be slow. Using a shallow container and a heat source can help speed up the process. Distillation:Another method, distillation, can also be used. It involves heating the saltwater, collecting the water vapor, and then cooling it back into liquid water, leaving the salt behind. Distillation is a more complex process and may not be suitable for a Grade 6 science class.
