Question

How would you confirm that a colourless liquid given to you is pure water?​

Answer 1

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⟹We can confirm if a colourless liquid is pure by setting it to boil.

⟹If it boils at 100°C it is said to be pure.

Answer 2

Answer:

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We can confirm if a colourless liquid is pure by setting it to boil. If it boils at 100°C it is said to be pure. But if there is a decrease or increase in the boiling point, we infer that water has added impurities hence not pure.

The boiling point and freezing point of the given liquid comes out to be 100 °C or 373 K and 0 °C or 273 K respectively under one atmospheric pressure

Explanation

Evaporate the colourless liquid on a low flame. If no residue is left and boiling exactly at 100 ºC, then it is pure water; otherwise, not. The boiling point and freezing point of the water are 100 °C or 373 K and 0 °C or 273 K at one atmosphere of pressure. The boiling point of water varies with atmospheric pressure. When any impurity in water is found, it will change the boiling point of water.

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