Filtration and Evaporation

We use filtration and evaporation to separate out a mixture of water, sand and salt. The sand is removed using filtration, as it did not dissolve in the water. The remaining solution is heated until the water evaporates, leaving behind the salt. Chemistry - Atoms And Bonding - Learning Points. Sand is insoluble in water. Insoluble substances can be separated by filtration. Salt is soluble in water. Soluble substances can be separated by evaporation. A Twig Experiment Film. Let students experience real experiments in lab conditions anywhere, from setup, method all the way through to analysis and real-world application.