How does adding salt affect the freezing point of water?

Question

anonymous · Answer

when you add salt to water it increases the density water freezes at 0 degrees at 1 atmosphere pressure. Salts density is 2170kg/m3 and water density is around 1000kg/m3, so by adding them you get a relatively heavier liquid. which changes the freezing and boiling points.

anonymous · Answer

thank you!

anonymous · Answer

ain´t no thang

anonymous · Answer

The answer to this problem lies in thermodynamics. The change from ice to water is one from an ordered system to a less ordered one, so heat is required to move the molecules about. So likewise there is some heat given off when water turns to ice - energy cannot be created or destroyed, merely interchanged between systems. When some salt (or sugar) is added to the water then this is less ordered than pure water, so the temperature at which the transition takes place is lower. I saw a good site for explaining this further: http://www.animations.physics.unsw.edu.au/jw/freezing-point-depression-boiling-point-elevation.htm