See what happens when you mix oil, water, vinegar, bicarbonate of soda and a bit of colour.
The science behind our experiments:
Experiment no. 1: The water (or vinegar) in pipettes form ‘bubbles’ in the oil because they don’t mix – water molecules are more attracted to each other than to oil molecules.
Experiments no. 2 and 3: The vinegar (acid) and bicarbonate of soda (alkali) fizz because together they produce carbon dioxide gas.
What you’ll need:
Tin foil trays or any tray or dish with a lip
Pipettes or old Calpol syringes
Baby oil or vegetable oil
Bicarbonate of soda
We did our experiment in the garden on a mat which helped contain mess.
I filled a washing up bowl with warm soapy water to have close by, along with an old towel, for washing hands or utensils.
Be careful – any oil spills will be slippy if walked on.
I disposed of the colourful, oily water on one of our garden flowerbeds – probably best not to pour down the sink or toilet.