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Rainbow Lab
Submitted by: Jennifer L.
Objectives:
• To develop skills measuring chemicals with a graduated cylinder.
•
To practice using the metric system.
• To test precision and ability to follow directions.
•
To practice lab safety procedures.
Materials:
• Rack with 6 Test Tubes
•
Two 10 milliliters (mL) Graduated Cylinders
• One 25 milliliter (mL) Graduated Cylinder
• Two Beakers
•
Two Pipettes
• One bottle each of red, blue, and yellow "chemicals" (share with the group)
Step-by-Step Procedure:
Part 1:
1. Make sure there is a small piece of tape around the top of each test tube. They should be labeled (in order): A, B, C, D, E & F.
2. Fill a beaker half full of water (it doesn't have to be exact). Use this to rinse your graduated cylinder and test tubes between
colors. You will only use the sink ONCE at the end of the lab.
3.
The second beaker will remain empty and will be used to collect your "waste" water.
4. Into test tube A, measure 25 mL of RED liquid.
5. Into test tube C, measure 17 mL of YELLOW liquid.
6.
Into test tube E, measure 21 mL of BLUE liquid.
Part 2:
1. From test tube C, measure 4 mL and pour into test tube D.
2.
From test tube E, measure 7 mL and pour into test tube D. Swirl.
3. From test tube E, measure 4 mL and pour into test tube F.
4. From test tube A, measure 7 mL and pour into test tube F. Swirl.
5.
From test tube A, measure 8 mL and pour into test tube B.
6. From test tube C, measure 3 mL and pour into test tube B. Swirl.
7. Do NOT pour out the liquids! Measure the liquid in each test tube (HINT: graduated cylinders are used to precisely measure
liquids). Record the final milliliters (mL) on the data table on the back of this paper.
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