Why only NaHCO3, precipitates, when CO2, is passed
through the ammonicai brine?
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Answer:
Only NaHCO₃ is a precipitate as the other substance NH₄Cl which is formed during the reaction is highly soluble in water.
Explanation:
NaCl + NH₃ + H₂O + CO₂ -------> NaHCO₃ + NH₄Cl
The carbon dioxide is dissolved in water. When it dissolves, some of it forms carbonic acid, H₂CO₃. Some of the carbonic acid dissociates, producing hydrogen carbonate ions. When NaCl is added to aqueous NH₄HCO₃, a precipitate of sodium hydrogen carbonate, NaHCO₃, forms.
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