Can salt be separated from water by freezing?
469919
Sounds like a trick question. In the north we know that putting salt on ice makes it melt. In the arctic regions only the salty sea water is still water. The ice and snow are actually fresh water. Salt lowers the temperature that water freezes at. However, if you can freeze dry the salt it will separate from the water. This is the method that's used to filter Ice Beer. So technically you could if done right but just freezing it is a difficult process because you'll need something very very cold as a coolant. This would be a good series of experiments if you can get someone that can handle dry ice (frozen C02).
663929
The salt cannot penetrate the ice crystall immedately
335293
Freeze dry it. Start by flashfreezing in your favorite cryogen (such as liquid nitrogen) then put it in a vacuum chambger and wait a couple of days.\n\nFreeze drying does a nice job of preserving the structure of the material while getting rid of essentially all the water.
562622
Let a chemistry student explain it.  \nThis here is something called a colligative property. A colligative property is a property that is affected by how many particles are involved.  \n\nNow, it just so happens that freezing point lowering is a colligative property.  That means that if you have stuff floating around in water, it needs to be colder in order for that water to freeze.  We put salt on icy sidewalks because when salt particles are in the water, the temperature has to be a lot lower in order for the ice to stay frozen.  That means that the ice is a lot less likely to stay frozen, so it melts.  \nI hope I helped!
323207
You could test whether or not salt really does make water freeze more slowly or boil more quickly. Just get four containers of water--two for boiling and two for freezing--and a thermometer. \n\nWith one of the containers without salt, put a thermometer in it and boil and time how long it takes. Mark the boiling point temperature and time. \n\nDo the same thing but one of your containers with salt. Compare your temperatures and times.\n\nThen, you can do the same two steps with freezing with the other two containers.\n\nIf you wanted to get really crazy, you could test to see whether a lot of salt vs. a little amount of salt makes a difference. Or, if you wanted to tone it down, you could do only one--the boiling or the freezing. \n\nThis seems to me like concepts that a second grader could handle.\n\nGood luck!
194492
Salt raises the boiling point of the water. So if you add salt to the water, water boils at a higher temperature than 100C and cooks the pasta faster. It is the same procedure for the roads. Salt lowers freezing point of the water, so ice freezes at a temperature lower than 0C. If it is -5C outside the water doesn't freeze so the roads don't become slippery because of ice. Also this principle is used in the cars, i.e. antifreeze liquid.
23033
If you were able to get the salt solution cold enough, it would freeze. However, if you put two ice trays side by side, one filled with water, the other filled with salt water, and chilled them to the point where both froze, the would both be the same temperature. However, once the cold was taken away, the salt solution would melt at a much lower temperature than the water only cubes.\n\nWhat salt does when added to water is decrease the temperature at which water will freeze -- as well as melt. How much the freezing/melting point is lowered depends on how much salt is added. The higher the concentration, the lower the freezing/melting point.
10363
The freezing point drops, by the Clapeyron equation. See the attached reference for details. \n\nThe answer above is dealing with ideal gases, not liquid water.
748490
If you are asking how to separate a mixture of water and salt, then you need to distill the water.  Distillation separates materials by adding increasing amounts heat in order to boil off the materials at theri respective boiling points.  The material that boil at a lower temperature would be removed first.  As you increase the tempreature, higher boiling temperature materials are separated.\n\nSince the water boils and the salt does not, all you need to do is heat the mixture up until it boils.  The water will vaporize and can be captured in another container, leaving the salt behind in the original container.
240715
The answer to this problem lies in colligative properties.  The salt ice solution will have a lower freezing point because by adding the salt, the solution is going through freezing point depression, which means that the solute is spreading apart the molecules of the solvent, thus requiring a lower temperature to freeze.
209819
Add water to dissolve the salt.  Drain water and boil off.  Salt is now separated from sand.
439741
there is a couple ways to do it. the first one is to insert the ice in a ice-chest and add salt around the ice the other option is to buy dry ice try to cover the regular ice with a plastic or with something to keep the regular ice separate from the dry ice and the dry ice around the plastic this would help to keep the ice cube frozen
1010626
Could be that different chemical compounds freeze at different temperatures.  Water freezes at a lower temperature than 36 degrees but not everything does.  That is also like why you put salt on ice to thaw it, it lowers the freezing point, so it has to be a lot colder before you get ice.
351009
Water with a high salt concentration, and plasma (electrically charged gas)
782187
When salt (NaCl) is absorbed into water (H2O) A new molecule is formed (NaH2ClO). When this new molecule is frozen, the crystalline structure is much stronger than that of regular water. This is why icebergs sink ships and ice cubes can be crushed by your refrigerator.
684151
The freezing point of pure water is 0°C, but that melting point can be lowered by the adding any solvent such as a salt. Depending on the amount of salt the freezing temperature of a saline solution can range from below 0°C to -21.1°C. The frozen solution is a mixture of separate NaCl·2H2O crystals and ice crystals, not a homogeneous mixture of salt and water. This heterogeneous mixture is called a eutectic mixture. \nThe use of ordinary salt on sidewalks is effective because it requires a colder temperature to freeze water and it is a cheaper alternative to other solvents or methods of ice removal.
66544
Salt will lower the freezing point of water. That is why the use in on the roads in winter.