We’re going to take two everyday materials, salt and vinegar, and use them to grow crystals by creating a solution and allowing the liquids to evaporate. These crystals can be dyed with food coloring, so you can grow yourself a rainbow of small crystals overnight.
The first thing you need to do is gather your materials. You will need:
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Vinegar is a weak acid, which helps the salt crystals to form.
What does the vinegar do in the solution?