which loses heat faster pure h2o ice or salt water?

Question

If you have a tub of ice with the same mass as a tube of salt water which would return to room temp faster. Why?

Answer 1

It depends,

If the salt water and the Ice were at the same tempurature, being 32 degrees F/0 degrees C or lower, the Ice would because the Ice would melt and the water returning to room tempurature would heat up more ice to its tempurature and melt little by little constantly warming up, the salt water on the other hand would be insulated by its own salt, salt is used as a melter for ice on roads because as it bonds as it comes incontact, lowering the freezing point of the liquid. But if you look at the ocean, no matter how cold (or hot) it gets over the liquid, saltwater will always be slower because it is more dense.

now if they start off at different tempuratures, have fun. You may even discover the acctual rate and mass that both cool at the same rate cause volume and density matter.

Answer 2

The reason that salt makes water boil faster is because the salt has a lower vapor pressure then water so when you add salt to water you are lowering the overall vapor pressure witch causes the water to boil at a lower temperature. So although water comes to a boil faster when you add salt the temperature at witch the water boil's at is lower. Put another way if salt is dissolved in water, the number of molecules at the surface of the water are less than for the pure water. So the molecules are more diluted by less salt in the water. Witch creates a lower vapor pressure and a lower vapor pressure means that a higher temperature is needed to boil the water in the solution, so the boiling point is elevated. i hope this helps The answer is that salt raises the boiling point. Salt has a much higher vapor pressure than water. The above answer seems to say that the boiling point is both raised and lowered, which is contradictory. I hope this is clear