GROWING CRYSTALS LAB. Purpose: To observe the formation and evaluate the shape of crystals and to identify factors that affect the growth of crystals as well as try to identify unknown crystal types. Materials. 150 ml graduated cylinder Wax pencil Seed crystals/paperclip Filter paper
150 ml graduated cylinder
Label a cup with your group’s names and salt letter, A, B, C, D
1. Measure out 20 grams of the unknown salt.
2. Put this in a glass beaker and add 50 ml of warm water and stir until all salt dissolves.
3. Add 10 more ml of water if the salt is not completely dissolved. Continue to do this until all of the salt dissolves up to a max of 150 ml total volume.
4. Label a stick with your salt letter. Make a stick with a string hanging and tie a paper clip to the end of the string so it does not touch the bottom of the plastic cup.
5. Pour your solution into the cup and place the string into the solution. Set the cup on top of the lab bench and cover it with a piece of paper towel.
6. Make observations today and every day for the next week.
Example: This experiment provided the opportunity to observe the growth of crystals and identify…..
2) State the results. Any growth? Where? How long did it take to see growth? What shape? How many?
3) Provide an overall summary of the results.
4) What do you think the crystal types were? A, B, C, and D.
5) What errors or factors could have affected the growth of your crystals? What else could you do with this lab to extend or improve on this experiment?