Calcium Carbonate (CaCO3)

Calcium carbonate is a very important compound and is present in huge quantities in rocks such as:

  • Chalk
  • Marble
  • Limestone

Calcium compounds from calcium carbonate

Quick Lime (Calcium Oxide)

Heat the calcium carbonate up in a kiln and quick lime (calcium oxide) forms.


Slaked Lime (Calcium Hydroxide)

Add a few drops of water to the quick lime and slaked lime forms (sounds like a magic trick right?)

The presence of the aqueous solution of calcium hydroxide can be tested by bubbling carbon dioxide in it.

This results in a milky appearance to form.

Uses of calcium carbonate

Calcium carbonate has a ton of important industrial uses, ranging from making cement to decreasing the acidity of soil.

Uses of calcium carbonate include:

  • Manufacturing of glass
  • Manufacturing of cement
  • In extraction of iron and steel in the blast furnace (to remove the impurity silicon(IV)oxide)
  • To neutralize the acidity in soil and lakes caused by acid rain.

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