Seawater clean-up: Using Evaporation to separate salt from Water

Students are asked to think about all of the chemicals and substances inside the oceans of the Earth. After probably getting a few answers like "fish" students should move onto ideas such as salt, sand, and pollutants.

Students recap the idea of filtration to remove insoluble "garbage islands" from the sea and are then introduced to the idea of evaporation to remove the salt. The use of producing fresh water from brine as well as salt is discussed.

After completing a class risk assessment, students complete a practical experiment. Evaporating salt from "seawater" in an evaporating dish.

Students write their conclusion and then improve using expert language.