Question

A sample of water was found to have a boiling point of 101.5°C at normal (1 atm) atmospheric pressure.

1. Is water pure?
2. Will this water freeze at 0°C

Answer 1

1. Water is not pure because if it would have been pure its boiling point would be 100°C.
   the boiling point of temperature is raised due to dissolved impurities in it.
2. Impurities lower the freezing point hence this water will freeze at a lower temperature than 0°C.