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How to test the ph of water school holiday activity

Recommended for kids aged 8+.

How does climate change impact our oceans and waterways?

Use this at-home experiment to discover how carbon dioxide from increased fossil fuel pollution causes acidity levels in our oceans to rise.

Create an easy pH indicator using a colourful vegetable – purple cabbage! – and put this to the test.

To find out more about climate change and what you can do to help here.

This activity requires adult supervision and some assistance.

How to test the pH of water by the Australian Museum.

We know the increased carbon dioxide from fossil fuels in the atmosphere causes climate change.

But how does it affect our oceans and waterways?

Let's find out.

What you need; two glass cups, purple cabbage, reusable straw, safety glasses, water, pot to boil cabbage, knife and pH chart.

Step one

Cut cabbage and put in the pot to boil. Allow it to cool, then pour out the water.

Step two

Fill the glasses 2/3 full.

Step three

Put your safety glasses on.

Step four

Use the straw to blow into the solution. Observe the change in colour.

Step five

Match with a colour on the pH chart to test the acidity. By blowing into the water, you are adding carbon dioxide and causing the acidity to rise.

When carbon dioxide from increased fossil fuel pollution enters sea water, it becomes more acidic.

Even a small change can destroy sea life. Find out more and what you can do.