Sea water freezes at lower temperature than distilled water but boils at higher temperature.give reason
Answers
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.
Hello friend,
Sea water contains common salt (NaCl) as impurity.
According to colligative properties, when non-volatile solids are added to water, number of water molecules free to interact with each other decreases.
Hence, there is
1) Freezing point depression-
Freezing point depends upon the attraction between intermolecular attraction in the liquid. When salt iis added to water, it decreases the attraction among water molecules, thus the freezing point decreases.
2) Boiling point elevation-
Boiling point is reflected by the vapour pressure of the liquid. After addition of salt, there is lowering of vapor pressure. Thus the boiling point increases.
Thus, sea water freezes at lower temperature but boils at higher temperature as compared to distilled water.