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ZingPath: Properties of Solutions

Let’s Decrease the Freezing Point of Water

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Properties of Solutions

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Let’s Decrease the Freezing Point of Water

Chemistry

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You will discover and learn all about solutions and their basic properties, including their freezing point and electrical conductivity. Discover a few ways to even make things dissolve faster.

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Now You Know

After completing this tutorial, you will be able to complete the following:

  • Explain the relationship between solubility and freezing point.

Everything You'll Have Covered

How does the addition of salt affect the formation of a crystalline structure as water freezes?

~ Under normal circumstances, as water turns to ice, water molecules slow down and eventually form a crystalline structure. This occurs at 0C. When salt is added to water, the ions that form the structure of salt get between the molecules of water and slow down the formation of this crystalline structure. At 0C, the salt water will not freeze; rather, it will freeze at a lower temperature.

Explain why salt is sprinkled on icy roads.

~ When salt is sprinkled on ice, it dissolves into the ice and drops the freezing point of water from 0C to below 0C. This makes the ice melt and prevents it from refreezing until it reaches a much lower temperature. Therefore, sprinkling salt on icy roads makes the roads safer to travel.

What purpose does antifreeze serve in a car engine?

~ In the winter, antifreeze is added to the water in car radiators to prevent the water inside the radiator from freezing. The antifreeze lowers the temperature at which the water freezes, which allows the water to move freely throughout the radiator. If the water inside the radiator froze and could not move freely, the engine of the car would overheat.

Tutorial Details

Approximate Time 2 Minutes
Pre-requisite Concepts Students should have a general understanding of the following terms: water melting point, icing, and salting.
Course Chemistry
Type of Tutorial Animation
Key Vocabulary water melting point, icing, salting