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Make up Labs

Make up Labs. 4.1 and 4.3. Experiment 4.1 Dissolving a solid in a liquid. Purpose, Hypothesis, and Materials should come from your own pre-lab based on section 4.1 of the green book and the following procedure Procedure is on the next slide. Experiment 4.1 Dissolving a solid in a liquid.

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Make up Labs

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  1. Make up Labs 4.1 and 4.3

  2. Experiment 4.1 Dissolving a solid in a liquid • Purpose, Hypothesis, and Materials should come from your own pre-lab based on section 4.1 of the green book and the following procedure • Procedure is on the next slide

  3. Experiment 4.1 Dissolving a solid in a liquid Procedure • Collect materials • Add water to test tubes • A groups - 20 ml B groups – 5 ml • Add 0.3 g of orange solid • Place stopper on test tube and shake • If the solid completely dissolved, add 0.3 g more • Record observations and data • Keep track of total orange solid added January 21, 2014

  4. Experiment 4.1 Dissolving a solid in a liquid • Observations • How many grams did you add to the 20 ml test tube? • How many grams did you add to the 5 ml test tube? • How did the colors compare in each test tube throughout the experiment? • Conclusion • Restate hypothesis, was it supported, what evidence shows this, what are possible sources of error?

  5. Lab 4.3: Comparing concentrations of solutions Pre Lab – Due Tuesday January 28

  6. Lab 4.3: Comparing concentrations of solutions • Purpose: To compare the concentration of saturated solutions • Hypothesis: None required for this experiment • Materials: • 2 test tubes 5. Evaporating dish • 5 g of Sodium Chloride (NaCl) 6. Watch glass • 5 g of Sodium Nitrate (NaNO3) 7. Burner stand • 2 stoppers 8. Burner

  7. Lab 4.3: Comparing concentrations of solutions • Procedure: • Mass 5 grams of sodium chloride (A) or 5 grams of sodium nitrate (B) • Place substance in a test tube that contains 5 ml of water • Put the a stopper on the test tube and shake vigorously • Mass a clean dry evaporating dish and watch glass • Pour the liquid into the evaporating dish (be careful not to pour any of the undissolved solid in the evaporating dish).

  8. Lab 4.3: Comparing concentrations of solutions • Procedure: • Mass the evaporating dish liquid and watch glass together (system before heating) • Place the watch glass on top of the evaporating dish. • Heat to dryness • Allow the evaporating dish to cool • Mass the evaporating dish with its contents and watch glass (system after heating) • Calculate the concentrations of the solutions.

  9. Lab 4.3: Comparing concentrations of solutions

  10. Lab 4.3: Comparing concentrations of solutions

  11. Lab 4.3: Comparing concentrations of solutions

  12. Lab 4.3: Comparing concentrations of solutions • Conclusion • Write a conclusion about which solution had the greater concentration and why.

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