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Why it does that is complex, but below is a pretty good description.
The following is taken from the site listed to the left of this answer, but that page has a lot of additional information, and this is the most important part. This is the real reason the vapor pressure of salt solutions are decreased:
"The reason dissolved solutes (such as salt) increase boiling point is that the solute must come out of solution in order for the water to boil. This costs entropy (the entropy of solution). Boiling is entropically driven, hence the reduction in the net entropy gain of boiling results in a higher temperature needed for the reaction to go. To put it without jargon: for a little packet of water with dissolved salt to turn to steam the salt atoms must, in the course of their random zooming about, ALL simultaneously leave the packet. This is not a likely event. It becomes more likely as the temperature (i.e. the average speed of zooming about) becomes higher, though, and at a certain temperature above the ordinary boiling point it becomes sufficiently likely to allow boiling in spite of the handicap. You can also see that the effect will naturally increase with the concentration of dissolved solutes (i.e. the number of salt atoms per packet that must simultaneously leave)."
Salt will increase the boiling temperature of water.
If you dissolve 1 mole (58.43 g) of NaCl in 1 kg of pure water the resulting solution will boil at 101.04°C.
What else can I help you with?
Does salt affect steam temperature?
No, salt does not affect the temperature of steam. Adding salt to water increases the boiling point of the water, but once the water has turned into steam, the temperature of the steam remains the same.
Does temperature affect the amount of salt that dissolves in water?
Yes, temperature can affect the amount of salt that dissolves in water. Generally, as temperature increases, the solubility of salt also increases, meaning that more salt can dissolve in water at higher temperatures.
What can affect ocean waters density?
The temperature of the water and the salt content of the water.
Is water temperature could affect the reaction of table salt?
Yes.
Does the temperature affect the speed at whih the salt dissolves in water and why?
yes, because salt is polar molecule
Does salt affest the freezing point of water and why?
The addition of salt to water will affect the freezing point as it the freezing point temperature is lowered. It's not the salt that lowers the temperature but it's because a new solution that was created.
What affect does salt have on the boiling temperature of water?
it has an effect on waters matter making the temperture of the water to be contained
Will the temperature go higher or lower if you add salt to the water?
Adding salt to water will lower the freezing point and raise the boiling point of the water, but it will not directly affect the temperature at which the water is heated or cooled.
How do the solutes affect the frezzing pointand boiling points?
Salt water freezes at a lower temperature and boils at a higher temperature.
How does temperature affect how quickly salt dissolves in water?
Temperature affects how quickly salt dissolves in water by increasing the kinetic energy of the water molecules, which in turn increases the rate of collisions and interactions between the salt and water molecules. As a result, higher temperatures typically lead to faster dissolution of salt in water.
How does adding salt to water affect the temperature?
It does not affect the temperature of the water, but solutes raise the boiling point and lower the freezing point.
What is the temperature if you put salt in water?
Adding salt does not effect the temperature.Answer:Adding salt does not change the temperature at the time you add the salt, but it raises the temperature at which the water will boil
