Question

How do the freezing point and boiling point of ocean water compare to those of distilled water?

• A. Ocean water freezes at a lower temperature and boils at a lower temperature
• B. Ocean water freezes at a lower temperature and boils at a higher temperature
• C. Ocean water freezes at a higher temperature and boils at a lower temperature
• D. Ocean water freezes at a higher temperatur e and boils at a higher temperature

Answer 1

The correct option is B Ocean water freezes at a lower temperature and boils at a higher temperature

Ocean water contains huge amount of salt compare to distilled water. Therefore, the boiling point is raised, and the melting point is lowered which is known as boiling point elevation and freezing point depression respectively.
When solute (salt) is added in the solvent (water) then solvent molecules take more time and temperature to make vapor pressure and causes the boiling point of the solvent increases. Freezing point depression is another colligative property that works the same way, so if you add salt to water you lower its freezing point as well as raise its boiling point.