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Freezing Point Depression

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Poor Man's Ice Cream

My Ice is Depressed

Credit: Paul Wilkinson
Source: http://flic.kr/p/bQ4upc
License: CC BY-NC 3.0

[Figure1]

 If you thought store bought ice cream was just a rip-off, well I have some good news for you.  This video below will give you a cheap and easy homemade method of making ice cream.  Luckily, this should not be a terrible mess. Watch the video and try it yourself!  Trust me, this all has to do with freezing point depression.  And you thought learning about freezing point depression was pointless!

Creative Applications

  1. What is the freezing point of milk? (Ignore the added extract, sugar, etc.  Search for it online)
  2. Before putting the salt in the big bag of ice, measure the temperature inside of it.  What is the reading?
  3. Place the salt into the bag of ice now.  Wait 30 seconds.  What is the temperature of the ice/salt? What effect did the salt have on the ice?
  4. Why do you think the milk was able to turn into ice cream by putting it in a bag of ice/salt? (Hint: Think about all the temperatures you found in questions 1 to 3)

Image Attributions

  1. [1]^ Credit: Paul Wilkinson; Source: http://flic.kr/p/bQ4upc; License: CC BY-NC 3.0

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