Discussion
When carbon dioxide gas is bubbled through a brine solution, saturated with ammonia, which compound is formed ?
Answer: D
The compound formed is NaHCO3.
This is the Solvay (ammonia-soda) process. CO2 bubbled through brine saturated with ammonia gives ammonium bicarbonate, which reacts with sodium chloride: NaCl + NH3 + CO2 + H2O → NaHCO3 + NH4Cl. Sodium bicarbonate, being sparingly soluble, precipitates.
Na2CO3 is obtained only afterwards, by heating the bicarbonate. CaCO3 is the limestone used to make CO2, and ammonium carbonate is not the product that separates.
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