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
- 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