Question

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

Answer 1

The sea water freezes at lower temperature than distilled water but boils at higher temperature, because salt is present in it.

The salt present in the sea water take up some amount of heat which makes the boiling point of sea water higher as compared to distilled water and the presence of salt in sea water depresses the freezing point which makes it longer to freeze.

Answer 2

Reasons:

• Sea water is composed mostly of salt. (Nacl) Due to presence of impurity of impurities and non volatile solids Boiling point increases and melting point decreases.  
• The number of water molecules free to become freeze decreases due to  the presence of impurities.  
• The freezing point depends upon the attraction between the molecules of the liquid.
• Boiling point depends upon the vapor pressure of the liquid.
• Salt absorbs heat greatly.

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

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