Plan a fair test to find out if dissolving table salt in water will affect the time it takes for the salt solution to freeze.
Plan your fair test using these three different amounts of table salt: 5 g, 10 g and 15 g.
You will need to think about:
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What you would need to keep the same.
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What measurements you would take.
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How many trials you would do.
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Whether you need a control.
