which water boils faster salt or tap water?

Question

For a science fair project.

Answer 1

Tap water. Dissolved salt raises the boiling point, so salt water takes longer to boil.

Answer 2

Tap water boils faster.

As someone said before, salt raises the boiling point. The reason you add salt when cooking pasta is so the water gets hotter. Pure water boils at 100 degrees celcius (at sea level pressure). Without the salt, that's the hottest you'll get the water. Adding salt raises the boiling point, so the water can get hotter.

So, salt water boils 'slower' because it takes longer to get the temperature up to the boiling point.

Answer 3

Tap Water. The salt (Sodium Chloride) will dissociate into ions in water, most likely leading to a stabilization of the water molecules since they are polar and like to interact with charged and polar things. Since boiling the water is exciting it to the point where it becomes a gas this increased stability from the salt should make it take more work to become a gas...or boil.

Answer 4

answer: the tap water boils faster than salty water.
Read on Colligative property (Boiling Point Elevation).

the salty solution can't boil at the same temperature as the pure solvent. If the vapor pressure of the solvent escaping from the solution is smaller than the vapor pressure of the pure solvent at any given temperature, the solution must be heated to a higher temperature before it boils. The lowering of the vapor pressure of the solvent that occurs when it is used to form a solution therefore increases the boiling point of the liquid.

Answer 5

Tap water... The sodium chloride raises the boiling poing. That's why when you make pasta, you wait until the water's boiling to add the salt.

Answer 6

Tap water. Just as salt is used to to lower the temperture at which water freezes it also raises the temperature at which is needed to boil.

Answer 7

Salt, or just about anything mixed in water, will raise the boiling point, making it take longer to boil.

Answer 8

Tap water will boil at a lower temperature so it requires less energy to boil. Thus it boils faster.

Answer 9

As soon as any of the salt dissolves in the water, the boiling point of the water will begin to rise -- by about one half degree Celsius for every 58 grams of salt dissolved per kilogram of water. In fact, any non-volatile soluble substance will raise the boiling point of water. That is why antifreeze (ethylene glycol) provides boiling protection in winter as it simultaneously provides freezing protection in the summer.

Answer 10

Tap water boils faster.