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Solubility of Magnesium Hydroxide
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Transcript
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Errors and Modifications
- Measurement errors
- Changed amount of HCl added each time to achieve neutral solution.
Procedure
Questions?
- Measure 10 mL of milk of magnesia using a graduated cylinder.
- Pour about 50 mL of distilled water into 250 mL beaker.
- mix in milk of magnesia
- add 5 to 10 drops of indicator solution
- drop in magnetic stir to mix the solution
- measure 5 mL of hydrochloric acid solution with the graduated pipet
- add hydrochloric acid to the beaker and stir.
- repeat last 2 steps until the solution in the beaker is green (pH 7).
Results
It was found the optimum amount of hydrochloric acid added to the solution to make it neutral was 8.25 mL.
Le Chatelier's Principle
Reactions:
Mg(OH)2(s) <-> Mg2+(aq) + 2OH-(aq)
H+(aq) + OH-(aq) -> H2O(l)
The Magnesium Hydroxide is normally basic. The introduction of HCl makes the reaction shift right or forward so basic OH- neutralizes the acidic H+ making the overall reaction more acidic. When adding more magnesium hydroxide the reaction shifts left or reverse because less magnesium hydroxide needs to disassociate to neutralize the H+.
Solubility of Magnesium Hydroxide
Materials
- Hydrochloric acid solution, HCl, 3 M, ~20mL
- Milk of magnesia, 10mL
- Universal indicator solution, 5-10 drops
- Distilled water
- Beaker, 250-mL
- Beral-type pipets, graduated, 2
- Graduated cylinder, 10mL
- Magnetic stir bar
- Magnetic stir plate
Solubility of Magnesium Hydroxide
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