Make Slime with Glue and Contact Lens Solution

This recipe from Scientist Factory shows you how to make a very popular slime.

Equipment

• PVA glue
• Baking soda
• Contact lens solution with boric acid
• Water

Instructions

1. Prepare 100 ml PVA glue
2. Add 100 ml water
3. Stir in 1/4 of a teaspoon baking soda and 1 tablespoon contact lens solution
4. Stir until you have the desired consistency

What you can discuss

The PVA molecule is thread-like with many strands. These strands have to get entangled and bound together for the glue to become slime. The baking soda and contact lens solution with boric acid are responsible for making this happen. A chemical reaction happens when boric acid and baking soda come into contact with each other. The boric acid turns into borax, which is the key ingredient. Borax has the ability to bind itself to two strands of the PVA molecule at the same time. This is why you will see the slime thicken as you stir all the ingredients together. More and more PVA strands get attached to borax which creates a slimy consistency.

 

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