CaCO3-CaO-Ca(OH)2-Ca(HCO3)2-CO2

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These compounds are all related to calcium carbonate and its decomposition products.

CaCO3: This is calcium carbonate, a common mineral found in rocks and the shells of marine organisms. It is used in a variety of industrial processes, such as in the production of cement and lime.

CaO: This is calcium oxide, also known as quicklime. It is produced by heating calcium carbonate to high temperatures, causing it to decompose into calcium oxide and carbon dioxide. Calcium oxide is used in the production of cement, as a desiccant, and in various other chemical processes.

Ca(OH)2: This is calcium hydroxide, also known as slaked lime. It is produced by reacting calcium oxide with water. Calcium hydroxide is used in various applications, including in the production of soap, as a flocculant in water treatment, and in agriculture as a soil amendment.

Ca(HCO3)2: This is calcium bicarbonate, a compound formed when carbon dioxide dissolves in water containing calcium carbonate. It is found in natural mineral springs and is used in the treatment of water to increase alkalinity.

CO2: This is carbon dioxide, a greenhouse gas that is produced during the decomposition of calcium carbonate into calcium oxide and carbon dioxide. Carbon dioxide is also released during the reaction of calcium hydroxide with carbon dioxide to form calcium bicarbonate.