Answer

ACID and BASE

 

CO2 + NH3 + H2O -----> NH4HCO3

  1. Recall that ammonia vapors turn red litmus blue. This is the "litmus test" for a base!
  2. Although carbon dioxide does not turn blue litmus paper red, it is weakly acidic. It gives a somewhat "sharp" or "sour" taste to water
  3. Acid Base reactions are exothermic, they give off heat.