Question

Sea water freezes at lower temperature than distilled water but boils at higher temperature.give reason

Answer 1

sea water have impurities in it and due to impurities its vapour pressure becomes less in comparison to the vapour pressure of distilled water so its boiling point increases then normal and its freezing point decreases from the normal.

Answer 2

The major constituent of the sea water is salt

The water in the sea contains impure substances which increases the boiling point of the water as the number of free molecules to freeze are reduced.  

The attraction between the molecules characterizes the freezing point while the vapor pressure characterizes the boiling point.

Salt is a thermal insulator.

Reason: The presence of salt and impure substances in the sea water.

Hence, sea water freezes at lower temperature than distilled water but boils at higher temperature.

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