Aim:To prepare and submit pure product of aluminum hydroxide and calculate the % yield

Apparatus&Chemicals Required:

Beaker 100ml, glass rod, funnel, filter paper, distilled water, potash alum, sodium carbonate.

Discussion: It occurs as aqueous white viscous suspension of hydrated aluminum oxide having varying amounts of basic aluminum carbonate.

Uses:

Aluminum hydroxide gel is a very effective slow-acting antacid.

                  Al(OH)3 + 3 HCl  → AlCl3 + 3 H2O

It is widely used in the treatment of hyperchlorydria.

 

Preparation:

  • Dissolve 5.16g of potash alum in 10 ml water in a beaker.
  • Dissolved 3.15g sodium carbonate in 10ml water and boil it.
  • Slowly add the solution of potash alum to boiling Sodium carbonate solution.
  • The precipitate of Aluminum hydroxide is collected, Washed until it becomes free from sulfate.

Reaction:

 

3Na2CO3 + 2KAl(SO4)2 + 3H2O → 2Al(OH)3 + 3Na2SO4 + K2SO4 + 3CO2

Calculation:

Molecular weight of  2KAl(SO4)2 = 96 g mol 1

Molecular weight of  Al(OH)3 =78 g/mol

% yield = Practical yield/ Theoritical yield X 100

Report: The Percentage yield of the prepared Aluminum Hydroxide was found to be _____% 

 

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