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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.
Solution 1
The metal compound ‘A’ is CaCO3 (calcium carbonate).
\[\ce{CaCO3 (s) + 2HCl (aq) -> CaCl2 (aq) + CO2 (g) + H2O (l)}\]Calcium Carbonate + Hydrochloric acid → Calcium Chloride + Carbon dioxide + Water
Solution 2
The gas that can extinguish a burning candle is carbon dioxide is formed by the reaction of dilute hydrochloric acid reaction with metal carbonate. When a metal compound ‘A’ reacts with dilute hydrochloric acid, it produces some fizz or effervescence. The compounds formed in this reaction is calcium chloride and it shows that the metal is calcium carbonate. By this, we can state that the compound A is calcium carbonate. Calcium carbonate reacts with the dilute hydrochloric acid to form calcium + carbon dioxide + water. Therefore this product that is formed can extinguish a burning candle.
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