Facts That Are Notable About Calcium Carbonate | WorldOfChemicals

Remarkable facts of Calcium carbonate

Calcium Carbonate

Calcium carbonate or CaCO3 is one of chemical compound found in the rocks as a mineral calcite and aragonite mostly particularly as a limestone, chalk or a marble. Although the fact that they are available in various forms they are chemically similar but differ physically. They differ in terms of whiteness, thickness, purity and homogeneity.

Similar to limestone, calcium carbonate is a biogenic rock, and is more compressed than chalk. Calcium-carbonate is a bristly-crystalline, metamorphic rock alike marble that is formed when chalk or limestone is re-crystallized. Huge sediments of marble are obtained in North America and in Europe for example in Carrara, Italy, where the pure white "statuario marble" is found. Calcium carbonate crystals are also described as calcite.

How calcium carbonate is prepared?

The massive amount of bulk calcium carbonate used in industry is obtained by excavating or mining. Calcium carbonate can be produced from pure quarried source which is used for food and pharmaceutical industry.

However, calcium carbonate is made from oxides of calcium. Calcium oxide is dissolved in water to form calcium hydroxide. To precipitate the desired solution carbon dioxide is passed through calcium hydroxide which is signified as precipitated calcium carbonate (PPC).

CaO + H2O -> Ca (OH) 2

Calcium oxide + Water → Calcium hydroxide

Ca (OH) 2 + CO2 → CaCO3 + H2O

Calcium hydroxide + Carbon dioxide → Calcium carbonate

Occurrence in the earth

Geological sources

Pure forms of calcium carbonate are calcite, aragonite and vaterite. Significant source of calcium carbonate include limestone, chalk and marble.

Extraterrestrial source

There is a strong presence if calcium carbonate on mars, beyond earth. The evidence proves that calcium carbonate have been detected in more than one location specifically in Gusev and Huygens hallows. This shows indication of presence of liquid water also. 

Solubility of calcium carbonate in Water

In pure water, calcium carbonate is poorly soluble i.e. 47 mg/L in normal atmospheric conditions.

The equilibrium reaction of the solution is shown by the equation.

Calcium carbonate -> Calcium ions + Carbonate ions

The product for this equation is [Ca2+] [CO32−]

Industrial applications of calcium carbonate

The foremost usage of calcium carbonate is in construction industry, moreover as a material for buildings or as limestone for roads and also as component of cement. Yet, since weathering is mainly caused by acid rain, calcium carbonate in the form of limestone is not used in building but it is only utilized as a raw/primary material for building substances. It is also used for purification of iron from iron ore in a furnace. Carbonates are calcined to form calcium oxide. Calcium oxides forms a slag i.e. stony waste matter of metals of impurities and extracted purified iron.

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