Question

Heating of calcium bicarbonate gives:
A.Calcium oxide and $C{O_2}$
B.Calcium carbonate, water and $C{O_2}$
C.Calcium bicarbonate and $C{O_2}$
D.Calcium hydroxide and $C{O_2}$

Answer 1

We must remember that in organic chemistry, bicarbonate also known as hydrogen carbonate is an intermediate form in the deprotonation of carbonic acid. It is a polyatomic anion with the chemical formula $HCO_3^ -$ . Calcium bicarbonate or calcium hydrogen carbonate has a chemical formula $Ca{(HC{O_3})_2}$ .

Complete step by step answer:
We must remember that the calcium bicarbonate is a white-coloured crystalline powder. It exists only in aqueous solution containing calcium cations and bicarbonate anions.
When bicarbonates are heated strongly, they form carbonates and emit carbon dioxide along with water.
The chemical reaction for calcium bicarbonate when heated can be expressed as,
$Ca{(HC{O_3})_2}\xrightarrow{\Delta }CaC{O_3} + C{O_2} + {H_2}O$
On the other hand, limestone is a useful rock. It was used for building, making roads and many other things. Limestone is also called calcium carbonate. When heated strongly it forms calcium oxide (slaked lime). This calcium oxide when dissolved in water forms calcium hydroxide (lime water). If we bubble carbon dioxide through calcium hydroxide solution, it forms a milky suspension of calcium carbonate.
From this study and by observing the options given above, we can clearly observe that there is only one reaction which is given by a calcium bicarbonate, while the other three are products of the outcome of the limestone cycle.
Thus, the correct answer to the question is option B.

Note:
As we know that calcium carbonate is when ingested does not do much harm. But it may cause irritation to skin, eyes and the respiratory tract on inhalation. It is commonly and widely used as a food additive, as an anti-caking agent and as a colour stabilizer. We must remember that calcium carbonate also causes hardness of water. We must have heard the term hard water many times. It occurs due to the presence of calcium carbonate in water.