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The Freezing Time of Water with Different Quantities of Salt

  • Category: Science
  • Subcategory: Chemistry
  • Topic: Sodium
  • Page: 1
  • Words: 531
  • Published: 17 December 2018
  • Downloads: 23
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I’ll put different quantities of salt in a ice tray with water and freeze it at 32 degrees fahrenheit. I’m going to check the water every 10 min. It will most likely not freeze faster because it ice melt faster. The definition of freeze is to become hardened into ice or into a solid body; change from the liquid to the solid state by loss of heat.How does salt melt ice. The salt makes it harder for the water molecules to bond together in their rigid structure. In water, salt is a solute, and it will break into its elements. So, if you’re using table salt, also known as sodium chloride (NaCl), to melt ice, the salt will dissolve into separate sodium ions and chloride ions.

Often, however, cities use calcium chloride (CaCl2), another type of salt, on their icy streets. Calcium chloride is more effective at melting ice because it can break down into three ions instead of two: one calcium ion and two chloride ions. More ions mean more ions getting in the way of those rigid ice bonds. Why do the put salt on the road. The salt helps the ice melt faster. What is interesting is that this effect is used all over the place. Often, salt is put on roads to melt ice. If there’s a lot of ice, you need a lot of salt. If the temperature drops below -21°C, it won’t work at all. Saltwater has a much lower freezing point (the freezing point is the temperature where something freezes) than freshwater does. And the more salt there is in it, the lower the freezing point gets.

So in order to know the exact temperature that it’s going to freeze, you have to know just how salty it is. For saltwater that’s as saturated as it can possibly get (i.e. there’s no way to dissolve any more salt in it no matter how hard you tried), the freezing point is -21.1 degrees Celsius. This is when the saltwater is 23.3% salt (by weight).As the water starts to freeze, the salt gets left in the liquid. So if you start out with water that isn’t saturated with salt, as it freezes the leftover water will get saturated. So if the water starts to freeze at, for example, -10°C, more will freeze as it’s cooled further until finally the last bit will freeze at -21.1°C.

Thus for un-saturated saltwater the freezing happens over a range of temperatures, not all at one exact temperature, unlike pure water.In liquid water, all of the water molecules are constantly moving very quickly. The motions that are most important for liquid water are rotations (the water molecules spin) and translations (the water molecules move from place to place).

To freeze into ice, the water molecules need to lose these motions to become “stuck” into place in a specific pattern, called the ice crystal structure. As liquid water is made colder and colder, the motions of liquid water molecules become slower and slower. When water is at its freezing point, the liquid water molecules that “crash” into the surface of ice are moving slow become “stuck” in place. This is how ice forms at low temperatures.

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