The background level of ammonia gas (NH3) in the atmosphere is less than 0.05 pp

Question

The background level of ammonia gas (NH3) in the atmosphere is less than 0.05 ppb(v) and thus has very little effect on precipitation pH. But in some areas, such as downwind of huge feedlots, ammonia levels can be quite high. In parts of southern California the atmospheric levels are as high as 25 ppb(v). What is the pH of rain in equilibrium with 25 ppb(v) of ammonia gas and 390 ppm(v) of carbon dioxide? You can ignore the background sulfur dioxide and anthropogenic sulfuric and nitric acids. (Hint: you will need to use Henry

Explanation / Answer

The charge conservation equation is:
NH4+ + H+ = HCO3- + 2CO3(2-)+ OH-

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