water testing

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what type of crystals do we use and what do we add to it

use copper II sulphate and add water to it.

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Next step?

Put it on the flame of the bunsen burner. Then it results in a white precipitate, if you add water and it turns blue. It will show that water is pure

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how else can we test it

put water in temperature in 100 degrees, if it boils its pure.

Put water in temperature in 0 degrees. If it freezes it is pure.

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