Question

Choose the correct statements regarding Calcium carbonate?

• A. Can be obtained by passing carbon dioxide through slaked lime.
  
• B. Can be obtained by the addition of sodium carbonate solution to $CaC{l}_2$
• C. It is a white fluffy powder, insoluble in water.
• D. All of the above.

Answer 1

The correct option is D All of the above.

Calcium carbonate can be obtained by passing carbon dioxide through slaked lime.
$C{a}_{(}OH{)}_2+C{O}_2\to CaC{O}_3+H_{2}O$
Excess of $C{O}_2$ leads to the formation of water soluble $Ca(HC{O}_3{)}_2$
It can also be obtain by the addition of sodium carbonate solution to $CaC{l}_2$.
$CaC{l}_2+N{a}_{2}C{O}_3\to CaC{O}_3+2NaCl$
It is a white fluffy powder, insoluble in water.

Theory
Preparation:
It can be obtained by passing carbon dioxide through slaked lime.
$C{a}_{(}OH{)}_2+C{O}_2\to CaC{O}_3+H_{2}O$
Excess of $C{O}_2$ leads to the formation of water soluble $Ca(HC{O}_3{)}_2$
By the addition of sodium carbonate solution to $CaC{l}_2$.
$CaC{l}_2+N{a}_{2}C{O}_3\to CaC{O}_3+2NaCl$
Properties:
It is a white fluffy powder, insoluble in water.
It decomposes to give $C{O}_2$ when heated to 1200 K.
$CaC{O}_3\to CaO+C{O}_2$
It reacts with dilute acid to liberate carbon dioxide.
$CaC{O}_3+2HCl\to CaC{l}_2+H_{2}O+C{O}_2$
$CaC{O}_3+H_{2}S{O}_4\to CaS{O}_4+H_{2}O+C{O}_2$
Uses:
As a building material in the form of marble.
In the manufacture of quicklime.
Specially precipitated $CaC{O}_3$ is used in the manufacture of high quality paper.
It is used as an antacid, mild abrasive in toothpaste, a filler in cosmetics.
$CaC{O}_3$ along with $MgC{O}_3$ is used as a flux in the extraction of metals such as iron.