How to Make Baking Soda Crystals

Have you wanted to make a crystal? Have you wanted to get rid of some baking powder? Have you wanted an experiment that runs over a couple days? Well, then try this easy, and fun crystal making experiment. No hard-to-find stuff, just, pretty much water, and baking soda.


  1. 1
    Heat up about 2 cups of water to a boil.
  2. 2
    Add the water to a bowl
  3. 3
    Dissolve baking soda into the water until it is at its saturation point*
    • When something is saturated, it means that no more granules can be dissolved into the water.
  4. 4
    After this is done, now is the time to add your food coloring (optional)
  5. 5
    Set up your plate in between two of your cups, so it's a cup, plate, then a cup.
  6. 6
    Add the baking soda water evenly into both of your cups.
  7. 7
    Cut about a yard of yarn, and fold it in half.
  8. 8
    Tie knots, or beads at each of the ends as weights.
  9. 9
    Put one end of the yarn into one cup, and the other end into the other cup, so the middle of the yarn is hanging over the plate.
  10. 10
    Secure each end to the sides of the cups to prevent drooping.
  11. 11
    Put your experiment somewhere where it won't be disturbed.
  12. 12
    In a few days, you will see big crystals forming on the string, as stalactites. Later, crystals will form on the plate, as stalagmites.
  13. 13
    After a week, or so, your yarn might dry up. If you want crystals to keep forming, add more saturated water to the cups.
  14. 14
    Good luck, and have fun!


  • Try putting different colors in the cups, like red, and yellow, or blue, and red.
  • Good for a science fair.
  • You can, instead of baking soda, try other things like salt, sugar, alum, or baking powder. These might not work as well, but you can try!
  • Try not to move these. You can, but crystals may fall off. If they do, put them in the cups. They will re-dissolve.

Things You'll Need

  • Baking soda
  • water
  • a pot
  • a spoon
  • yarn
  • two cups
  • a plate
  • a bowl
  • two paper clips
  • food coloring (required).

Article Info

Categories: Baking