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

NCERT Class 9th Science Ch 2 Is Matter Around Us Pure
If there is any impurity present in the given solution it will affect the boiling point. Boiling point will be more than 100 if its not pure water.
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This is the process for confirming whether the liquid is pure water or not ---------> Take a sample of colourless liquid and put on stove if it starts boiling exactly at 100 ºC then it is pure water. Any other colourless liquid such as vinegar always have different boiling point. Also observe carefully that after some time whole liquid will convert into vapour without leaving any residue.
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