Question

Boiling Point of hard water is more than that of distilled water at the same atmospheric pressure why

Answer 1

Because Hard water is more basic than the neutral pH distilled water

Answer 2

The boiling point of hard water is more than that of the distilled water at the same atmospheric pressure because the hard water contains sulphates, carbonates, bicarbonates, calcium and magnesium in the form of impurities while the distilled water only contains H2O molecules without any impurities.

These impurities actually distort the boiling point of water making it quite higher at the same atmospheric pressure.