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Why only NaHCO3 precipitates when CO2 is passed through the ammonical brine?

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Why only NaHCO3 precipitates when CO2 is passed through the ammonical brine?

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Answer. When CO2 is passed through an ammonical solution of NaCl called ammonical brine only NaHCO3 precipitate due to its lowest solubility at 15°C in the presence of excess of CO2.
          Na+(aq) + HCO3-(aq)         NaHCO3(s)
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