The Limestone Reaction Cycle

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  • CALCIUM CARBONATE, CaCO3
    • CALCIUM OXIDE, CaO
      • CALCIUM HYDROXIDE, Ca(OH)2
        • CALCIUM HYDROXIDE SOLUTION
          • CALCIUM CARBONATE, CaCO3
            • CALCIUM OXIDE, CaO
              • CALCIUM HYDROXIDE, Ca(OH)2
                • CALCIUM HYDROXIDE SOLUTION
                  • This is known as limewater - it is used as a test for the presence of CO2.  The limewater turns cloudy because it reacts with the carbon dioxide to form insoluble calcium carbonate
                • Water is added to the calcium oxide to form calcium hydroxide
                • Calcium hydroxide is an alkali and therefore it is used by farmers to neutralise acidic soils and in industry to neutralise acidic gases
              • The calcium carbonate is thermally decomposed.  CO2 is given off as a product
          • This is known as limewater - it is used as a test for the presence of CO2.  The limewater turns cloudy because it reacts with the carbon dioxide to form insoluble calcium carbonate
        • Water is added to the calcium oxide to form calcium hydroxide
        • Calcium hydroxide is an alkali and therefore it is used by farmers to neutralise acidic soils and in industry to neutralise acidic gases
      • The calcium carbonate is thermally decomposed.  CO2 is given off as a product

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