Tuesday, February 5, 2008

Revision - Calcium Compounds

Calcium Oxide CaO
Calcium oxide is commonly known as quicklime, and is a material of primary importance in the building industry.

Calcium peroxide
Calcium peroxide (CaO2) is a solid peroxide with a white or yellowish color.

Calcium hydroxide
Calcium hydroxide (Ca(OH)-2)

Calcium hydroxide in solid powdered form is called slaked lime. A suspension of slaked lime in water is called milk of lime.

Calcium carbonate CaCO3
Calcium carbonate occurs abundantly as dolomite, MgCO3.CaCO3, a mixture of calcium and magnesium carbonates.

Calcium bicarbonate
Calcium bicarbonate (Ca(HCO3)2), also called calcium hydrogen carbonate, does not refer to a known solid compound; it “exists” only in a solution containing the ions calcium Ca^2+, dissolved carbon dioxide CO2, bicarbonate HCO3–, and carbonate CO3^2–.

Calcium chloride
Calcium chloride (CaCl2) is an ionic compound of calcium and chlorine.
It can be produced directly from limestone, but large amounts are also produced as a by-product of the Solvay process.

Calcium sulphate (CaSO4)
Calcium sulphate can be obtained by heating gypsum above 200°C.

Compounds of Aluminium: alumina, aluminium chloride and alums;

Aluminium oxide(Al2O3), also known as alumina, is the main component of bauxite, the principal ore of aluminium.

Aluminium chloride (AlCl3) is manufactured on a large scale by the exothermic reaction of aluminium metal with chlorine or hydrogen chloride.

Alum is a salt that in chemistry is a combination of an alkali metal, such as sodium, potassium, or ammonium and a trivalent metal, such as aluminum, iron, or chromium.

The most common form, potassium aluminum sulfate, or potash alum, is one form that has been used in food processing.

Posted by KVSSNrao at 8:59 PM 0 comments

Labels: Compounds-metals, Core-Points

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