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Measurement and Safety Lab

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Measurement and Safety Lab

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    1. Instructor: G. Nicole Magee Measurement and Safety Lab

    2. Purpose of this Lab 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.

    3. Materials Each group will have the following: 6 test tubes test tube rack 2 pipettes 50 or 100 mL beaker (or larger) with Red liquid 50 or 100 mL beaker (or larger) with Blue liquid 50 or 100 mL beaker (or larger) with Yellow liquid 1 beaker of clean water 1 empty beaker 2 - 25 mL graduated cylinders 2 - 10 mL graduated cylinders goggles Remember safety rules when working with chemicals and glassware!

    4. How will you be graded? You will be graded on: Group Participation Accurate Measurement Following Safety Procedures Proper Post Lab Clean Up Completed Data Table and Post Lab Questions Group Assignments Principle Investigator Materials Manager Safety Specialist Data Director If there is a 5th person in your group, then he or she will be the second in command to the principle investigator

    5. Procedure Part I Procedure Part II Label 6 test tubes in order : A, B, C, D, E & F. Fill a beaker half full with water. Use this to rinse your graduated cylinder and test tubes. The second beaker is for contaminated waste water. Into test tube A, measure 25 mL of RED liquid. Into test tube C, measure 17 mL of YELLOW liquid. Into test tube E, measure 21 mL of BLUE liquid. From test tube C, measure 4 mL and pour into test tube D. From test tube E, measure 7 mL and pour into test tube D. Swirl. From test tube E, measure 4 mL and pour into test tube F. From test tube A, measure 7 mL and pour into test tube F. Swirl. From test tube A, measure 8 mL and pour into test tube B. From test tube C, measure 3 mL and pour into test tube B. Swirl. Save your results . Measure the contents of each test tube and record how many mL were found in each test tube. Procedure: Read Twice!

    6. Data

    7. Analysis/Results Name the colors that you created. How many mL of liquid were in each test tube at the start of this lab? Why is it important to follow directions exactly? What would have happened if your measurements were not correct? Look at your hands. Do you have any stains on your hands? If so, those stains represent chemicals that would be on your skin right now! What could you have done to prevent this? How many mL of liquid did you have at the end of the lab? How many should you have? What are some reasons why you may have more or less than when you started?

    8. Conclusions Write a detailed explanation of why accurate measurement and following safety procedures are important?

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