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What happens when ammonical brine is carbonated?

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Answer. Ammonical brine is fed into carbonating tower and carbon dioxide is passed through it. Following reactions take place in the carbonating tower.
       CO2(g) + NH3(g) + H2O                NH4HCO3(1)
      NH4HCO3(1) + NaCl (brine)            NaHCO3(1) + NH4Cl(s)

The temperature of the mixture is lowered to 15°G and precipitates of NaHCO3 are obtained.

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