Salt and Vinegar Crystals
This easy and inexpensive project from Donna Godfrey lets you grow some crystals using materials almost everyone has at home.
1/4 cup table salt
2 teaspoons vinegar
1 cup water
Shallow dish, jar lid, or container
1. Cut a sponge so it fits in the bottom of the dish, container, or lid. Put
the sponge in the bottom of the dish.
2. Boil water. Remove from heat, and add a generous 1/4 cup of salt a little
at a time. Stir well after each addition of salt.
3. Add vinegar. Stir well.
4. Pour the salt and vinegar mixture carefully over the sponge, just enough
to cover the bottom of the dish. Pour the extra mixture into a container and
5. Put the dish in a safe, sunny place. After a few days, salt crystals will
start to form. If the salt and vinegar mixture evaporates, add more.
Salt is what we call the mineral halite. You boil the water because you can
dissolve more salt in hot water than in cold water. As you add more and more
salt, you will find that eventually no more salt will dissolve in the water.
The sponge soaks up the salt and vinegar mixture. As the solution
evaporates, salt crystals are left behind on the sponge. What shape are your
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