When heated strongly the calcuim carbonate in limestone decomposes to calcium oxide and carbon dioxide. When water is added to calcium oxide they react to produce calcuim hydroxide.
Calcium hydroxide is an alkali and so it can be used to neutralise acids. For example, it is used by farmers to neutralise acidic soild and in industry to neutralise acidic gases.
Calcium oxide is not very soluble in water but dissolves slightly to make limewater.Calcium hydroxide reacts with carbon dioxide to produce calcium carbonate, the main compound in limestone. Soluble - ability to dissolve, especially in water.
Equations for reactions in the limestone cycle:
1. CaCO3 -------- CaO + Co2
2. Cao + H2O -------- Ca(OH)2
3. Ca(OH)2 + Co2 -------- CaO
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