Chapter 2: Acids, Bases and Salts

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Acids,Bases, and Salts

Question:

Metal compound A reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle. Write a balanced chemical equation for the reaction if one of the compounds formed is calcium chloride.

Answer:

When a metal compound A reacts with dilute hydrochloric acid, a gas is produced that extinguished a burning candle. This means that the gas produced is carbon dioxide. One of product formed is calcium carbonate. This means that compound A is calcium carbonate. When calcium carbonate reacts with dilute hydrochloric acid, calcium chloride will form along with the evolution of carbon dioxide gas.

CaCO3 (s) + 2HCl (aq) → CaCl2 (s) + CO2 (g) + H2O (l)


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