Free PDFGrade 1 · Science · 30 min
Magic potions
Mix colourful potions and watch them fizz and foam.
I can see that more baking soda makes more foam.
A science experiment video with a free worksheet and answer key for teachers
About the video
In the video coloured potions fizz and foam when baking soda is added. At home your child pours vinegar and water into 3 jars, adds 1, 2 and 3 teaspoons of baking soda, and measures in cm how high the foam goes. Vinegar is an acid and baking soda is a base, and when they meet they react and make carbon dioxide gas. More baking soda makes more gas and higher foam, while the food colouring only adds colour.
What your child learns
- See that a reaction makes something new
- Measure foam height in cm with a ruler
- Compare low, middle and high foam
What's on the worksheet
- 1Predict first
- 2Measure the foam
- 3What did you see?
- 4The science behind it
- 5Count the bubbles
- 6Potion maths
- 7True or false
- 8Word match
- 9Draw your potions
You need
3 big jars (500 ml each), 1 tray, 600 ml vinegar, 150 ml water, food colouring in 3 colours, baking soda, 1 teaspoon, 1 ruler, a grown-up helper.
Safety
Do not drink the potions. Keep vinegar away from your eyes.
Tip for the adult
Hold the ruler against the jar before adding the baking soda, because the foam is highest in the first few seconds.
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