As part of the school physics curriculum, seventh graders are encouraged to grow crystals from salt on their own.
Necessary
- - two heat-resistant containers
- - water - 100 ml
- - table salt - 1 pack
- - a tablespoon
- - gauze or sieve
Instructions
Step 1
To conduct an experiment on growing a crystal from a salt at home, you will need two containers with a volume of at least 250 ml. One of them will be metal so that you can boil water in it, the other glass, for example, an ordinary 0.5 liter jar.
Step 2
Pour cold water into a metal container, bring to a boil and remove from heat. Let the water cool and boil it again. Then cool again and bring to a boil again.
Now pour one tablespoon of ordinary table salt into a container of boiling water. Add salt until it stops dissolving.
The resulting strong saline solution - brine - pour using gauze or a sieve into a heat-resistant container. If you are using a glass jar, pour the hot liquid gradually, in small portions, otherwise the jar may burst and you will get burns.
Leave the salt that has not dissolved in a metal container until the next time.
Cover the container with brine with a piece of gauze or any other cloth and leave for 1 - 2 days.
Step 3
After this time, carefully drain the liquid into a metal container with residual salt. Examine carefully the sediment on the bottom of the jar. Choose a few clear crystals that are still quite small. Transfer the rest of the salt to a metal container. Heat the liquid to a boil, stir the rest of the salt and add fresh salt if necessary. Strain the liquid back into the jar, taking precautions. When the liquid has cooled slightly, stir it with a spoon and dip the selected crystals into the liquid.
Step 4
Cover the jar again with a cloth and leave for another 1 - 2 days.
Repeat the manipulations with heating the liquid until you get crystals of a satisfactory size.
