Experiment Experiment Experiment: Le Chatelier's Principle

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Register to read the introduction… Prepare an ice water bath by partially filling one of the 50-mL beakers from your
LabPaq with tap water and crushed ice. Set aside.
2. Prepare a hot water bath by partially filling the second 50-mL beakers from
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Note: the reactions in Part II are much more subtle than those in Part I. You may have to wait 30 seconds or longer and look very carefully to observe the reaction and changes taking place! Use your magnifier to better see the changes.
1. Using a 24-well plate, add 5 drops of NaHSO4 sodium bisulfate solution to wells A1,
A2, and A3. Add 10 drops to wells A4 and A5.
2. Add one drop of thymol blue indicator to each well. Stir with a clean toothpick and
Solution turns wine .
3. Add one drop of Na2SO4 sodium sulfate solution to well A1 and stir with a clean toothpick. Compare the color of well A1 with that of well A2. Well A1 has an orange color compared to well A2 that is wine red.
4. Repeat Step 3, drop-by-drop, until you see a color change.
5. Add a few crystals of solid NaHSO4 to well A3. Stir with a clean toothpick, wait a while, and record your observations. Compare the color of well A3 with that of well
A2. Well A3 is purplish compared to A2 that is wine red
6. Repeat Step 5 until you see a color change. Precipitation occurs, the purplish solution becomes
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LabPaq CK-2 69
7. Use the marker pencil to label an empty pipet “A4.” Then squeeze the pipet bulb, place it in well A4’s solution, and slowly release the bulb to carefully suck up all the mixture into the bulb.
8. You need to place the pipet bulb from Step 7 into the hot water bath, but it will tend to float. To avoid this securely attach the pipet stem to a spoon handle with a rubber band. Then place the pipet bulb in the water bath, with the spoon handle outside of the beaker so as to not obstruct your observations.
9. Make sure the water bath is as hot as possible. If the water bath is not very hot the expected color change may be difficult to see. Place the pipet bulb from step 8 into the hot water bath. Record the beginning temperature of the hot water bath. Temperature: 97 degrees Celsius
10.Repeat Steps 7 and 8 with a second pipet for the mixture from well A5. Place this pipet into the cold water bath.
11.Record the beginning temperature of the cold water bath. Beginning temperature; 100 degrees Celsius.
12.When you observe changes in the mixtures in the pipets record your observations and the water bath temperatures. Solution turns light

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