Question

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

Answer 1

A given liquid can be confirmed as water by:

• If the boiling point of the liquid comes out to be $100°\mathrm{C}$ at atmospheric pressure, the liquid is water.

This is because water is a pure substance and a pure substance has a definite value of the properties like boiling point.

• Since water is a compound and hence a pure substance, the boiling point can be checked to confirm the same.

Compound: A compound is a pure substance in which elements combine chemically in a fixed composition to give a compound.

• They can be broken down into elements that make up the compound by using chemical or electrochemical methods.
• Example: Water $\left({\mathrm{H}}_2\mathrm{O}\right)$, Common salt i.e. Sodium chloride $\left(\mathrm{NaCl}\right)$