Question

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

Answer 1

Answer:

To confirm that a colourless liquid given to us is pure water we have to boil it.

As we know the boiling point and freezing point of the water are $100°\mathrm{C}$ or $373\mathrm{K}$ and $0°\mathrm{C}$ or $273\mathrm{K}$ at one atmosphere of pressure.

If any impurities are present in water it will change the boiling point of water and it will not boil sharp$100°\mathrm{C}$.

Conclusion:

So, to confirm that a colourless liquid given to us is pure water we have to boil it.