Notes on the uses of limestone and its products

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Indirect Uses of Limestone:

Lime:

* Manufacture

* Thermal decomposition is used.

* When calcium carbonate is heated strongly, it slowly disassociates into calcium oxide and carbon dioxide.

* This reaction takes place in a lime kiln.

* It is a reversible direction depending on the pressure and temperature.

CaCO3(s) --> CaO(s) + CO2(g)

(reversible)

* Uses of lime(CaO):

* Used as a drying agent.

* To manufacture soda glass(ny heating it with sdium carbonate)

* Alos used to make slaked lime. (Ca(OH)2)

Slaked lime(Calcium hydroxide)

* Manufacture

* Made by adding an equal amount of water to calcium oxide.

* This reaction is carefully monitored.

* Thius control is needed as it is a highly exothermic reaction.

CaO(s) + H20(l) --> Ca(OH)2(s)

* Uses

* Cheap industrial alkali.

* Used to reduce soil acidity

* Used in the manufacture of white wash.

* Used in glass manufacture and water purification.

* Limestone, a weak soln. of slaked lime is used to test for carbon diocide gas.

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