Limestone

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  • Created by: Calin
  • Created on: 28-04-15 21:35

Limestone

Metal carbonates such as calcium carbonate break down when heated strongly. This is called thermal decomposition. Here are the equations for the thermal decomposition of calcium carbonate:

calcium carbonate right facing arrow with heat (http://www.bbc.co.uk/staticarchive/24ac5d1dcb82bc24e9ac3908069170de44a9b545.gif) calcium oxide + carbon dioxide

CaCO3right facing arrow with heat (http://www.bbc.co.uk/staticarchive/24ac5d1dcb82bc24e9ac3908069170de44a9b545.gif) CaO + CO2

Other metal carbonates decompose in the same way. Here are the equations for the thermal decomposition of copper carbonate:

copper carbonate right facing arrow with heat (http://www.bbc.co.uk/staticarchive/24ac5d1dcb82bc24e9ac3908069170de44a9b545.gif) copper oxide + carbon dioxide

CuCO3right facing arrow with heat (http://www.bbc.co.uk/staticarchive/24ac5d1dcb82bc24e9ac3908069170de44a9b545.gif) CuO + CO2

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Limestone

Calcium carbonate also reacts with acid to make a calcium salt, carbon dioxide and water.

calcium carbonate + sulphuric acid → calcium sulphate + carbon dioxide + water

CaCO3 + H2SO4 → CaSO4 + CO2 + H2O

The type of salt produced depends on the type of acid. For example a reaction with hydrochloric acid would make a chloride (e.g. CaCl2)

Other carbonates that react with acids are magnesium, copper, zinc and sodium.

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