Crystal Size and Cooling Rate Activity

Step 1: Adding Alum

 

 

Step 5: Record size of crystals

Step 13: Compare size of crystals

Step 15: Place solution in freezer

Step 18: Compare size of crystals

Step 18: Record time, date and observations

Observation: Precipitate

Follow-up - Have the students propose other ways to speed up and slow down the cooling rate of the saturated solution. Make hypotheses about crystal size and test your hypothesis.

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