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Question
How would you confirm that a colourless liquid given to you is pure water?
Solution
- Every liquid has a characteristic boiling point. Pure water has a boiling point of 100°C (373 K) at 1 atmospheric pressure.
- If the given colourless liquid boils even slightly above or below 100°C, then the given liquid is not pure water.
- It must boil at a sharp 100°C. Thus, by observing the boiling point, we can confirm whether a given colourless liquid is pure water or not.
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