Frozen Salt
Grade Levels:
7-9
Question:
Does adding salt to water lower its freezing point?
Possible Hypothesis:
Adding salt does/does not lower the freezing point of water.
Materials:
Four 8-ounce plastic cups
Measuring cup
Box of table salt (sodium chloride)
Freezer
Thermometer
Teaspoon
Procedure:
- Fill four cups with six ounces each of tap water. Add a teaspoon of salt to one cup, two teaspoons to another, and three teaspoons to a third. Leave the fourth as your control.
- Place the cups in the freezer. Observe the cups periodically until a thin layer of ice forms on the top of the water, and then record the temperature of each cup.
- Record your observations.
Analysis and Conclusion:
Did adding salt lower the freezing temperature of the water? What was the effect of adding more salt to the water? Can you think of ways that this knowledge can be put to work for you?
Reprinted with the permission of the NEED Project. © 2008 National Energy Education Development Project - All Rights Reserved.
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Comments from readers
I will use this for my science project
3rd grade so i getting this one it look s sweet
thank u who ever made it
horace mann middle science project\
and mack 4 a's!!!!!!!!!!!
I so wanna do this it is so easy!!!!!$$$
PEACE...............
this year ~
so i have my 7th grade science fair coming up and i need some ideas, QUICK!
so what if i go asnd do this?
what if it doesnt work?
then what do i do...
love ya guys!
-no reason for living-