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4. Dissolved ammonia gas is a common contaminant in drinking water, streams, and rivers. The dissolved form can cause an unpleasant taste in the water and is toxic to many aquatic life forms. Gas-phase ammonia has an unpleasant odor similar to diapers or window cleaner. (d) When ammonia is dissolved in water, it can form the ammonium cation , which acts as a weak monoprotic acid with pKa 9.3. Write out the reversible dissociation reaction and sketch an alpha diagram. Label your axes, the alhpa curves, and any important values on the plot. (e) Fish are very sensitive to the un-ionized form, ammonia and concentrations as low as 1.0 mg/L can be toxic to them. If you took a sample of water downstream of a wastewater treatment plant and measured a pH of 7.9 and a total dissolved ammonia () concentration in the water of 0.1 M, would you expect a toxic effect on the fish in the river? Support your answer with calculations