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Milk Of Magnesia Lab
Objective: To see the acid-base neutralization of Milk of Magnesia when Hydrochloric Acid is added to it.
Materials:
Milk of Magnesia
3M Hydrochloric Acid
Universal Indicator Solution
Water and Ice
1 L Beaker
2 Pipets
Graduated Cylinder
Magnetic Stir Plate and Bar
Caution: Hydrochloric Acid is very strong and should be used with great caution. Do not inhale the fumes and immediatly wash off skin and clothing.
Procedures:
- Pour 20mL of Milk of Magnesia into the 1L beaker.
- Put the 1L beaker on to the magnetic stir plate and add the stir bar.
- Add the ice and water to the beaker to give a total volume of 800mL (use a good amount of ice) and turn the stir plate on, creating a vortex.
- Add about 3 pipets full of the indicator solution to the beaker. Observe for a few minutes. Record any changes.
- Add 1 pipet of 3M Hydrochloric Acid and observe the solution. Record what you observe.
- Repeat step 5 when all changes have stopped occuring. Continue repeating step 5 until the change is permanent.
Questions:
- What does the color of the original solution indicate?
- What change occured when the Hydrochloric acid was added? Why?
- How many mL of Hydrochloric acid did you add until the change was constant? Why did it become constant?
The solution should have gone through all the colors of the indicator, like a rainbow, when hydrochloric acid was added