Question

How will you confirm that a colorless liquid given is pure water?

Answer 1

1. Every liquid has a fixed boiling point. Pure water has a boiling point of $100$$ºC,$ or $373K$.
2. Hence, to verify if the colourless liquid is pure water, we will boil it and observe its boiling point.
3. The boiling point of water varies with atmospheric pressure.
4. If the liquid starts boiling at a sharp $100$$ºC,$ or $373K$, then the colourless liquid will be pure water.
5. Evaporate the colourless liquid on a low flame. If no residue is left and boiling strictly at $100°C$ then, it is pure water.