why does the salt increase the boiling point but decrease the melting or freezing point?
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The water molecules need more energy to produce enough pressure to escape the boundary of the liquid. ... 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.
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Salt is a solid. It has a higher boiling point.
Thus when dissolved in water (water is just taken for an example/convenience) the boiling point of water (100°C normally) + boiling point of salt (depends upon hiw much salt is dissolved).
Thus the boiling point becomes higher than water.
Now when water freezes it just has to freeze water particles/molecules. Now while freezing water the dissolved salt also needs to be freezed. Also the freezing point of salt is more than water.
Thus the freezing point of water ( starts as 4°C normally) + the freezing point of salt (depends on the amount of salt added).
The freezing point here decreases as it is harder to freeze the dissolved water than normal water.
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Thus when dissolved in water (water is just taken for an example/convenience) the boiling point of water (100°C normally) + boiling point of salt (depends upon hiw much salt is dissolved).
Thus the boiling point becomes higher than water.
Now when water freezes it just has to freeze water particles/molecules. Now while freezing water the dissolved salt also needs to be freezed. Also the freezing point of salt is more than water.
Thus the freezing point of water ( starts as 4°C normally) + the freezing point of salt (depends on the amount of salt added).
The freezing point here decreases as it is harder to freeze the dissolved water than normal water.
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