Thames & Kosmos Global Water Quality handleiding
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EXPERIMENT 3 Dissolving in water
In the last experiment, you were able to see how solid plant
particles can be filtered out of water. The example with the
colored water showed you that it can be a lot harder to remove
something from the water if it has become completely dissolved.
What will actually happen if you add salt to water?
You will need:
large and small measuring cups or a glass, spatula,
as well as: table salt (not included)
1
Fill the large measuring cup
halfway with warm water.
Add two full spatulas of
salt. Watch what happens
to the salt.
Next, stir with the
spatula. What do you
see now?
2
Transfer some of the liquid to the small
measuring cup and set it in a warm spot,
such as the window ledge, for a few days.
What happens?
Explanation:
At first, you can easily
see the grains of salt
in the water. When
you stir, they seem to
disappear, as the salt
dissolves in the water.
But it’s still there! After
a few days, the water
evaporates and you can
once again see the salt
as little crystals on the
bottom of the cup.
More Tests!
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Global Water Quality Manual 2013.indd 8 2/7/13 10:22 AM
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Productinformatie
| Merk | Thames & Kosmos |
| Model | Global Water Quality |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 3490 MB |
