String of Spikes

Simple Science Experiment for Kids- String of Spikes

String of Spikes

We are taking osmosis one step further in our String of Spikes experiment. Do you remember our last experiment called Growing A Gummy Bear? If you participated in that experiment then you know that osmosis is the way that water tends to move from “wetter” places into “drier” places. Now we’ll see what happens when the water is moved by osmosis isn’t just plain water but has something else dissolved or mixed into it.

Little Passports

Check it out in action!

Simple Science Experiment for Kids- String of Spikes

What you need:

  • Journal
  • Pens, Pencils, Crayons
  • 12 inches of cotton string
  • Baking Soda
  • 2 Plastic cups
  • Water
  • tablespoon
Result Timing: 2 days

What to do:

  1. First, fill the plastic cups with water.
  2. Then add 1 tablespoon of baking soda into each cup.
  3. Then put one end of the string in one cup and the other end of the sting in the other cup.
  4. In your journal draw a picture of your experiment and label it before. Write down what you think is going to happen, this prediction is your hypothesis. Let the string and the cups sit for two days.
  5. Do not stir, shake, jiggle, wiggle, or do anything else to the cups while you’re waiting.
  6. After two days, check on your experiment. What do you see? Draw a picture in your journal. Label it After.
  7. Write down any of your observations, or anything that you learned and check to see if your hypothesis was correct.

How it works

The water is attracted to the string because the string is drier than the water. It brings the baking soda with it, gradually soaking higher up on the string, The baking soda collects on the string forming small clumps or spikes.


Did you try this experiment? How did you like it? Let us know in the comments section below. Share your videos and photos with us on FacebookTwitter and Instagram using the hashtag- #sciencesunday We would love to see you doing the experiments!


Simple Science Experiment for Kids- String of Spikes

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