Preparation of magnesium hydroxide
Magnesium hydroxide in a white insoluble solid that is used as an antacid to relieve upset stomach. Obtain as solid
A).Method
B).Balanced equation
C).Net ionic equation
D)Observation
A) Method:
1. In a beaker, dissolve 5 grams of magnesium chloride hexahydrate (MgCl2•6H2O) in 50 mL of distilled water.
2. In another beaker, dissolve 5 grams of sodium hydroxide (NaOH) in 50 mL of distilled water.
3. Slowly pour the sodium hydroxide solution into the magnesium chloride solution while stirring continuously.
4. The solution should turn cloudy as the magnesium hydroxide precipitates out of solution.
5. Allow the mixture to settle for about 15 minutes.
6. Using a filter paper, filter the mixture to obtain the solid magnesium hydroxide.
7. Wash the solid with distilled water and allow it to dry completely at room temperature.
B) Balanced equation:
MgCl2 + 2NaOH → Mg(OH)2 + 2NaCl
C) Net ionic equation:
Mg2+ + 2OH- → Mg(OH)2
D) Observation:
The mixture turns cloudy as the magnesium hydroxide precipitates out of solution. The solid magnesium hydroxide obtained by filtration is white.
When Mg(NO3)2 reacts with NaOH and forms Mg(OH)2
A) write balanced equation
B).Net ionic equation
A) Balanced equation:
Mg(NO3)2 + 2NaOH → Mg(OH)2 + 2NaNO3
B) Net ionic equation:
Mg2+ + 2OH- → Mg(OH)2
When CaCl2 reacts with Na2CO3 and forms CaCO3
A).Write the balanced equation and net ionic equation
A) Balanced equation:
CaCl2 + Na2CO3 → CaCO3 + 2NaCl
B) Net ionic equation:
Ca2+ + CO32- → CaCO3
Formula for barium sulphate
BaSO4
Preparation of calcium sulphate
Calcium sulphate is slightly soluble solid that is used to make plaster.Prepare the solid.Mix solution well-the reaction may be slow to occur
A).method
B).Balanced equation
C).Net ionic equation
D).Observation
A) Method:
1. In a beaker, dissolve 5 grams of calcium carbonate (CaCO3) in 100 mL of dilute sulfuric acid (H2SO4) solution (1M).
2. Heat the mixture gently, stirring continuously to allow the reaction to occur. The reaction will produce calcium sulfate (CaSO4) and carbon dioxide (CO2) gas.
3. Allow the mixture to cool completely and the calcium sulfate to settle to the bottom of the beaker.
4. Using a filter paper, filter the mixture to separate the solid calcium sulfate from the liquid.
5. Wash the solid with distilled water and allow it to dry completely at room temperature.
B) Balanced equation:
CaCO3 + H2SO4 → CaSO4 + CO2 + H2O
C) Net ionic equation:
CaCO3 + H+ → Ca2+ + CO2 + H2O
Ca2+ + SO42- → CaSO4
D) Observation:
The mixture produces effervescence (bubbling) due to the release of carbon dioxide gas. Over time, the solid calcium sulfate settles to the bottom of the beaker. The solid obtained by filtration is white and slightly soluble.