Class 11 Chemistry The S Block Elements Calcium Carbonate

Calcium Carbonate (CaCO3)

  • It is a white fluffy powder that is insoluble in water and gets decomposed followed by the release of carbon-dioxide on heating to 1200 K.

CaCO3 + 1200k --> CaO + CO2

CaCO3 + 2HCl --> CaCl2 + H2O + CO2

CaCO3 + H2SO4 -->  CaSO4 + H2O + CO2



  • It is prepared by passing carbon dioxidethrough slaked lime.

Ca(OH)2 + CO2     -->  CaCO3 + H2O

 (Calcium Hydroxide)

  • It can also be prepared by the addition ofsodium carbonate to calcium chloride.

CaCl2   +   Na2CO3    -->  CaCO3 + NaCl


  • It is sued to manufacture of quick lime.
  • It is used as a flux in combination with magnesiumcarbonatein the extraction ofmetals such as iron.
  • It is also used as anantacid, mild abrasive in tooth paste and chewing gum.


Fig. Chewing gum and toothpaste

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