Making YOU the Scientist: Freezing Point Depression and Phase Changes

This lab activity explores two important science concepts: freezing point depression and phase changes. The freezing point of water is zero degrees celsius. In the first part of the activity you will lower the freezing point of water to below zero degrees celsius using ordinary table salt (sodium chloride). This is called freezing point depression.

Solid, liquid and gas are the three phases of matter. Phase changes occur when energy is added or removed from a substance. When energy is removed from a substance, the particles of the substance begin to move more slowly and when the freezing point is reached they will stop moving and the substance will change from a liquid to a solid. The freezing point of water is zero degrees celsius. In this lab activity you will use the ice, water and salt mixture, which is at a temperature below zero degrees celsius, to freeze the water in the test tube.

Of course, the most important application of freezing point depression is for making ice cream.

Link to video showing you how to make ice cream at home using freezing point depression:    • Homemade Ice Cream Without a Machine ...  

Link for sharing this video:    • Making YOU the Scientist: Freezing Po...  

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Chapters
0:00 Introduction
0:50 Depressing the Freezing Point of Water
3:05 Freezing Water with Freezing Point Depression
4:25 Frozen Water in the Test Tube
4:55 Separating Test and Solid Water
5:20 Explanation of Freezing Pint Depression
8:02 Applications of Freezing Point Depression
8:50 Making Ice Cream with Freezing Point Depression