The balanced chemical equation for the reaction of compound A (calcium carbonate) with dilute hydrochloric acid, where calcium chloride is one of the products, is: CaCO3(s) + 2HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g).
Explanation:
Compound A:
The effervescence and the gas extinguishing a candle suggest that the gas evolved is carbon dioxide (CO2). Since one of the products is calcium chloride (CaCl2), the metal compound “A” must be calcium carbonate (CaCO3).
Reaction:
When calcium carbonate reacts with hydrochloric acid, it produces calcium chloride, water, and carbon dioxide.
Balanced Equation:
To balance the equation, 2 moles of hydrochloric acid (HCl) are required for every 1 mole of calcium carbonate (CaCO3). This ensures that the number of hydrogen and chlorine atoms are balanced on both sides.