Experimentally Determining the Freezing Point of Water

In summary, the conversation discusses the use of ethylene glycol as antifreeze in cars and the freezing point of pure water. It is suggested to make a solution of 50 g of water and 50 g of ethylene glycol to protect the car in cold weather. The freezing point of pure water is experimentally determined to be 0 degrees Celsius, rather than assuming it. The use of the formula delta T = (Kf)(molality) is mentioned, but it is not specified if the Van't Hoff factor should be incorporated.
  • #1
magma_saber
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Homework Statement



1.Antifreeze used in your car is ethylene glycol, HO-CH2-CH2-OH. It is usually diluted 1:1. Assume that you made a solution of 50 g of water (solvent) and 50 g of ethylene glycol (solute). What temperature in Celsius would your car be protected to in cold weather? Assume the freezing point of pure water is 0 degrees Celsius.

2.Why is the freezing point of pure water determined experimentally instead of just assuming tha it is 0 degrees Celsius?


Homework Equations


Do i use the formula, delta T = (Kf)(molality)?
 
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  • #2
Yes for question number one , were you asked to incorporate the Van't Hoff factor?
 
  • #3
it doesn't say.
 

Related to Experimentally Determining the Freezing Point of Water

1. What is the purpose of experimentally determining the freezing point of water?

The purpose of this experiment is to determine the temperature at which water changes from a liquid state to a solid state, also known as its freezing point. This information can be used in various fields such as chemistry, meteorology, and food science.

2. What materials are needed for this experiment?

The materials needed for this experiment include a thermometer, a beaker or test tube, distilled water, and a source of heat such as a Bunsen burner or hot plate. Optional materials may include a stirring rod and a timer.

3. How is the freezing point of water determined experimentally?

To determine the freezing point of water experimentally, a small amount of distilled water is placed in a beaker or test tube and heated until it reaches its boiling point. The temperature is then slowly decreased while continuously stirring until the water begins to freeze. The temperature at which the first ice crystals form is recorded as the freezing point.

4. What factors can affect the accuracy of the experimental freezing point of water?

Some factors that can affect the accuracy of the experimental freezing point of water include variations in the purity of the water, the rate at which the temperature is changed, and the accuracy of the thermometer used. It is important to control these factors as much as possible to obtain reliable results.

5. How does the freezing point of water change with the addition of solutes?

The freezing point of water decreases with the addition of solutes, a phenomenon known as freezing point depression. This is due to the interference of the solute particles in the formation of ice crystals, making it more difficult for water to freeze. The amount of depression depends on the concentration and type of solute present in the water.

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