SNC1D-Rainbow Lab - Notes PDF

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SNC1D Chemistry

Rainbow Bright Lab

Purpose: To learn how to read and follow instructions accurately. To develop skills in measuring and recording data. Materials: 3 x 100 mL beakers Food colouring rack

Marker for labelling 50 mL graduated cylinder

Water 6 test tubes,

Procedure: 1) After reading the lab, design an appropriate data table with headings to record volume (including units) and observations of all test tubes. Create a descriptive title for your table. 2) Label the 6 test tubes: A to F. Be sure to keep test tubes in the rack. 3) Your teacher will have 3 beakers labelled 1 - 3. Each will have about 100 mL of water. There will be 10 drops of RED food colouring in Beaker 1, 10 drops of BLUE in beaker 2, 10 drops of YELLOW in beaker 3. 4) Put 19 mL of red water into test tube A. Put 18 mL of yellow water into test tube C. Put 18 mL of blue water into test tube E. Be sure to read at the bottom of the meniscus. 5) From test tube C, measure 4 mL of water and pour it into test tube D. 6) From test tube E, measure 7 mL of water and pour it into test tube D. Mix. 7) From the blue beaker, measure 4 mL of water and pour it into test tube F. Mix. 8) From the red beaker, measure 7 mL of water and pour it into test tube F. Mix. 9) From test tube A, measure out 8 mL of water and pour it into test tube B. 10) From test tube C, measure out 3 mL of water and pour it into test tube B. Mix. 11) Make observations about each of your test tubes. Record the final volume of each test tube. Pour your “rainbow” down the drain and then clean up. Data Table:

Questions: 1. What is a meniscus? Why is this important to scientists when measuring liquids?

2.

What is the reason water climbs up the side of the cylinder? Explain.

3.

Look at your data table. Are all the final volumes of your test tubes equal? Re-read the instructions and determine what the final volume of each test tube should be. How far off were you?

4.

Suggest at least 3 possible sources of error. Note: My partner messed up doesn’t count!

5. Measure 25 mL of tap water in a beaker. Pour the water out of your beaker into the graduated cylinder. What do you notice?

6.

Is a beaker a good instrument to use for measuring volumes? Why or why not?...