Ammonia (nh3) is a basic gas produced by the decomposition of urea. a major emission source of ammonia is cattle feed lots. determine the equilibrium ph of initially pure water that is exposed to air containing 25 ppb of ammonia, typical of polluted urban environments. assume that the temperature is 298 k and the total air pressure is 1 atm. neglect the presence of any other acid/base gases such as co2. additional information: nh4 + nh3 + h+ pka=9.23 nh4 + is a weak acid. nh3 is a weak base with henry’s law constant kh=62 matm-1 .