Crystal Garden


standards addressed: 3.c Students understand atoms and molecules kind solids by building up repeating patterns, such as the crystal structure of NaCl or long-chain polymers. 9.a Plan and conduct a scientific examination to test a hypothesis

Independent variable


Dependent variables

Crystal height as a function of temperature


Crystals grown in ~ room temperature (avr. Temp.= 23 C)


Crystal growth in cold temperatur (5 C).

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Crystal expansion in warmth temperature (41 C)


3 Sponges

1/4 cup Uniodized Salt

1/4 cup Distilled H20

1/4 Mrs. Stewart Bluing certified dealer (laundry whitener)

2 Tbsp. Ammonia

Food coloring

Glass pie bowl (3)

3 Thermometers


Arrange the sponges in the pie plates, cut them in appr. 1" pieces. Combine salt, water, buing agent and ammonia in a bowl and also mix well. To water the mixture end the sponges, and also spoon staying thick mixture end each plate.

Sprinkle drops of food coloring (using various colors will permit for an ext colorful crystals).

Place each pie plate in cold setting (refrigerator), heat environmnet (hot plate) and normal temperature setting respectively. Ensure ongoing temperature control by place a thermometer near each plate. Do sure areas are quiet and cost-free of vibrations.

Record hourly transforms (height the crystals)

Crystal development

Height Temp.

The table used to document data need to contain the independent variable (time) and the depedent variable. Additionally, the temperature can also be recorded to guarantee environmental problems are maintained. Although temperature measurements should be taken several times throughout every day, they deserve to be averaged to day-to-day temp. Readings.

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Crystal growth Warm T. Time (hr)
Height (mm) Temp. (C)
0 0 41
2 4
4 7
6 10
8 13

This is the table representing the data accumulated from the warm temperature sample. To make sure the salt crystals had enough time to develop, the data was tape-recorded at 2 hrs intervals. Clearly, the sample kept at warm temperature to be the many abundant and also fastest growing one. The table mirrors a remarkably comparable pattern of expansion at each time interval. The warm temp. Crystals flourished appr. 3 mm every 2 hours, and mainained that growth throughot the size of the experiment.

decision Growth manage Time (hr)
Height (mm) Temp (C)
0 0 23
2 0.5
4 2
6 4
8 5
16 5