Question

In an experiment, calcium carbonate reacted with different volumes of hydrochloric acid in water. One of the products formed during the experiment was carbon dioxide. The time taken for 0.89 of carbon dioxide to form was recorded. Why does the volume increase?

(a) Due to the dissolution of calcium carbonate
(b) Due to the formation of carbon dioxide gas
(c) Due to the addition of hydrochloric acid
(d) Due to the temperature change during the reaction

Answer 1

The volume increase in the experiment is due to the formation of carbon dioxide gas.

Step-by-step explanation:

The volume increase in the experiment is due to the formation of carbon dioxide gas (b). When calcium carbonate reacts with hydrochloric acid, one of the products formed is carbon dioxide gas. This gas occupies space and increases the overall volume of the system. The reaction can be represented by the equation: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + CO2(g) + H2O(l).