Predicting Products of Chemical Reactions

The purpose of this lab is to predict the possible products formed from the reaction. Then, you will observe the reaction to see if your prediction was correct. You will need to cite evidence to prove if your prediction was correct, and then write the balanced equation for each of them. You will need to support your final prediction with evidence.

Pre-Lab: BEFORE LAB you must write the…

  1. formula(s) and states of matter for the reactants,
  2. formula(s) and states of matter for the products.

During the Lab:

  1. Take photos or video of each reaction,
  2. Write down your observations, and
  3. Determine if you think your prediction was valid based on observations collected.

Post-Lab:

  1. For any reactions that did not match your predictions, make a list of possible products.
  2. How might you determine which product(s) you actually did form?
  3. “If ______is the product, then doing ______can confirm it because______.”
  4. In the future - use videos/pictures in a future animation…

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Station #1: Decomposition of potassium iodide

  1. Place a few pipettes full of the potassium iodide solution in the watch glass.
  2. Place the tips of the pencil electrolysis apparatus in the watch glass.
  3. Make sure to rinse the pencil tips with distilled water AND dry the pencil tips before moving on to lab station 5.
  4. DO NOT GET THE BATTERY WET.
  5. Waste goes in the waste beaker in the front of the room.

Station #2: Combination of carbon dioxide and water

  1. Grab a clean cup and straw and fill half way with tap water.
  2. Add bromothymol blue indicator (10-15 drops).
  3. Use the straw to blow bubbles in the water. Note: Do NOT inhale the water.
  4. Waste can be well rinsed down the sink.

Station #3: Reaction of hydrochloric acid with sodium bicarbonate

  1. Put a small amount (about the size of a pea) of sodium bicarbonate (baking soda) into a test tube.
  2. Add 1-2 pipettes full of aqueous hydrochloric acid.
  3. Record observations-make sure to feel the test tube.
  4. Clean up: Put the solution in the waste beaker. Rinse the test tube.

Station #4: Antacid reaction

  1. Place 10 drops full of milk of magnesia (magnesium hydroxide) into the test tube.
  2. Add 1-2 pipettes full of aqueous hydrochloric acid.
  3. Clean up: Put the solution in the waste beaker. Rinse the test tube.

Station #5: Decomposition of water

  1. You have a beaker of water already at your table. Place the bottom of the pencil tips of the electrolysis apparatus according to the picture for Station #1.
  2. Clean up: Remove the apparatus from the water and dry off the wet pencils. Leave the water in the beaker unless it’s looking discolored.

Stations #6-9:

  1. Use the reaction plate to mix 2-3 drops per aqueous substance on the X.
  2. Clean up: Wipe reactions in trash with gloves/paper towel; then wipe reaction plate with a clean wet paper towel.

Clean up when done with ALL stations: Wash the table and wash your hands with soap and water.

Station 1: decomposition of potassium iodide
Prediction #1 of Balanced Equation:
Observations (before, during, after):
Conclusion:
Prediction #1 (choose one: does/does not) match the observations because…
New Questions Based on Conclusion:
How we might test new questions:
Station 2: reaction of water and carbon dioxide
Prediction #1 of Balanced Equation:
Observations (before, during, after):
Conclusion:
Prediction #1 (choose one: does/does not) match the observations because…
New Questions Based on Conclusion:
How we might test new questions:
Station 3: reaction of hydrochloric acid and sodium bicarbonate
Prediction #1 of Balanced Equation:
Observations (before, during, after):
Conclusion:
Prediction #1 (choose one: does/does not) match the observations because…
New Questions Based on Conclusion:
How we might test new questions:
Station 4: antacid reaction (milk of magnesia - magnesium hydroxide - with hydrochloric acid)
Prediction #1 of Balanced Equation:
Observations (before, during, after):
Conclusion:
Prediction #1 (choose one: does/does not) match the observations because…
New Questions Based on Conclusion:
How we might test new questions:
Station 5: decomposition of water
Prediction #1 of Balanced Equation:
Observations (before, during, after):
Conclusion:
Prediction #1 (choose one: does/does not) match the observations because…
New Questions Based on Conclusion:
How we might test new questions:
Station 6: lead (II) nitrate with potassium iodide
Prediction #1 of Balanced Equation:
Observations (before, during, after):
Conclusion:
Prediction #1 (choose one: does/does not) match the observations because…
New Questions Based on Conclusion:
How we might test new questions:
Station 7: magnesium with iron (III) chloride
Prediction #1 of Balanced Equation:
Observations (before, during, after):
Conclusion:
Prediction #1 (choose one: does/does not) match the observations because…
New Questions Based on Conclusion:
How we might test new questions:
Station 8: copper (II) sulfate and sodium hydroxide
Prediction #1 of Balanced Equation:
Observations (before, during, after):
Conclusion:
Prediction #1 (choose one: does/does not) match the observations because…
New Questions Based on Conclusion:
How we might test new questions:
Station 9: magnesium with copper (II) sulfate
Prediction #1 of Balanced Equation:
Observations (before, during, after):
Conclusion:
Prediction #1 (choose one: does/does not) match the observations because…
New Questions Based on Conclusion:
How we might test new questions:

Stations #6-9 Reaction Plate

Potassium iodide
Lead (II) nitrate / X
Magnesium
Iron (III) chloride / X
Sodium hydroxide
Copper (II) sulfate / X
Magnesium
Copper (II) sulfate / X

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