Calcium compounds

Carbonates are bases but not alkali, so they turn universal indicator blue or purple. Carbonates react with acids to form salt, water and release carbon dioxide.

CaCO3 + 2HCl CaCl2 + H2O + CO2

All carbonates undergo thermal decomposition to form metal oxide and carbon dioxide. 

MgCO3 > MgO + CO2 

Calcium hydroxide produced in the limestone cycle is an alkali and can neutralize an acid. The products of a reaction are calcium salt and water: 

Ca(OH)2 + 2HCl >CaCl2 + H2O 

Mortar acts as a Binding material.

Ca(OH)2 + CO2 >CaCO3 + H2O 

Limestone – calcium carbonate, CaCO3, is a solid material found naturally. It decomposes thermally to form calcium oxide – quicklime, CaO and carbon dioxide, CO2. When water added to quicklime it forms calcium hydroxide – slaked lime, Ca(OH)2. Slaked lime reacts further with carbon dioxide to form the calcium carbonate solid precipitate.

CaCO3 >CaO + CO2

CaO + H2O >Ca(OH)2

Ca(OH)2 > CO2+CaCO3 

Uses of calcium carbonate

Cement – powdered limestone heated with powdered clay.

Concrete – mixture of cement, water, sand and crushed rock.

Glass – powdered limestone heated to high temperatures with a combination of sand and sodium carbonate.

Mortar – it holds other building materials together, it’s a mixture of calcium hydroxide, sand, and water. Lime in mortar reacts with carbon dioxide in the air producing limestone

This article was written by Anup Sharma

I am a life- long learner and learned not only to be an effective IB teacher but an Educational leader. I have motivated and guided thousands of students and tens of teachers till now. I have worked as educational leader in schools and successfully motivated the team to perform at their best. As an Educational leader I organised many events and competitions of both academics and sports. I have conducted Public examinations of a state of Diu as Centre superintendent appointed directly by Govt of India. More About Me

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