More on Separation glass tubing rubber stopper Salt water hot plate.

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Presentation transcript:

More on Separation glass tubing rubber stopper Salt water hot plate

glass tubing flask rubber stopper Salt water hot plate plastic tubing beaker Distillation

#1 The salt water boils #2 Only the water evaporates #3 the water condenses… #4 … and collects in the tube #5 which then runs into the cup. Liquid Gas Liquid Again

Imagine you are stranded on a deserted island and you look down beside you and find a piece of clear plastic! How might you clean the salty water so that you can drink it??

Solar Still Video

In the natural environment, there are many other substances in water – not just salt Not Just Salt …

As rainwater runs over rocks and soil, minerals are dissolved and carried away in solution. Nitrogen Phosphorous Potassium Calcium Magnesium Copper Zinc Iron

Water that contains a lot of dissolved minerals is called hard water. Hard water is natural and safe to drink. But: - more soap to lather - soap scum on baths - ‘scaling’ in kettles

Water that contains few dissolved minerals is called soft water. - rainwater - distilled water