Dec 19

Knotted Bones

You will need:

  • Thin chicken Bones
  • 1 cup vinegar
  • Clear jar or glass

What to do:

  1. Take some thin chicken bones and drop them in vinegar for a day. Take them out and they’ll be soft just like egg shells.
  2. Now you can tie them in a knot, just like a piece of string.
  3. Leave them sitting out on the table and they’ll get hard again!

What is happening:

  • What makes our bones hard? Calcium carbonate
  • Vinegar is an acid known as acetic acid.
  • When calcium carbonate and acetic acid combine, a chemical reaction takes place and carbon dioxide (a gas) is released.  This is what the bubbles are made of.
  • The chemical reaction keeps happening until all the carbon in the bones is used up — it takes about a day.
  • When you take the bones out of the vinegar it’s soft because all of the carbon floated out of the bones in those little bubbles.
  • Take them to school for sharing time and see if your classmates can figure out how you did it!

Source: KidZone

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