Question

how would you can firm that a colourless liquid given to you is pure water​

Answer 1

Answer:

Take a sample of colourless liquid and put on stove if it starts boiling exactly at 100∘C 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.

Explanation:

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Answer 2

Answer:

Pure water does not conduct electricity, only the one with few dissolved salts does. By checking the conductivity one can ensure that the given substance is pure water