* Photo 1 and 2: Mix
one table spoon of table salt with 20 ml water in a 50-ml vial.
* Leave the suspension
until it is transparent (photo 3).
* Carefully pour out the
clear solution into a second vial.
* Leave it to dry up.
Explanation:Table
salt is a mixture which contains insoluble substances: Read on the package.
During evaporation of water
crystal cubes of the pure substance -called sodium chloride - are growing.
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..........................last modification:
11.07.2001