To prepare calcium carbonate (CaCO3).

 EXPERIMENT

OBJECT: To prepare calcium carbonate (CaCO3). 

REFERENCES

1. Singh H.R., Kapoor V.K. “Practical Pharmaceutical chemistry”, Vallabh Prakashan, Ed. I st, 2008, pp 109. 

2. Chatwal G.R, “Pharmaceutical chemistry inorganic” Himalaya publishing house, 5th Ed. 5th, 2010, pp 161-163. 

REQUIREMENTS 

Chemical required: Sodium carbonate (Na2CO3), Calcium carbonate (CaCl2) 

Apparatus required: Beaker, funnel, glass rod & Measuring cylinder. 

THEORY 

Synonyms: Precipitated Chalk

 Chemical formula: CaCO3 

Molecular weight 100.09

 It has been regarded as one of the most abundant and widely distributed calcium salts. Calcium carbonate is found in nature as limestone, chalk, marble, argnite, and calcite and one of the main constituents of pearls and shells. It is a fine white odorless, tasteless microcrystalline powder. It is practically insoluble in water but its solubility is increased by the presence of any ammonium salts or carbon dioxide. The official drug is the precipitated calcium carbonate containing 98 to 100.5 % of calcium carbonate. Hardness of water is due to its presence. On commercial scale calcium carbonate is obtained by mixing the boiling solution of calcium chloride and sodium carbonate.

Na2CO3 + CaCl2 → CaCO3 + 2 NaCl

PROCEDURE 

Take 3g of sodium carbonate (Na2CO3) and dissolved in 30 mL of distilled water in a 100mL beaker. Now take 3g of calcium chloride (CaCl2) and dissolved it in 30mL of water. Then both the salts are mixed along with constant stirring. Allowed to stand for 15 minutes, the precipitate of calcium carbonate is produced. Solution is filtered with the help of filter paper. A white fine powder of calcium carbonate is formed as a residue on the filter paper and dry. 



PROPERTIES 

It is a fine white odorless, tasteless micro-crystalline powder. It is practically insoluble in water but its solubility is increased by the presence of any ammonium salts or carbon dioxide. 

USES 

  1. It is used as an antacid. 
  2. As a calcium supplement in calcium deficiency. 
  3. Also used as food additive and homeopathic medicines.
  4.  As an inert filler for tablets and other pharmaceutical products. 
  5. As a source of dietary calcium supplement.
  6.  In the preparation of toothpaste. 
  7. Externally it is used as dentrifices because having abrasive property.
  8.  As a major component of blackboard chalk. 

RESULT Calcium carbonate was prepared and submitted.

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