Nitrogen is discharged from wastewater treatment facilities into rivers and streams, usually as NH₃ and NH₄⁺:NH₃(aq) + H₂O(l) ⇄ NH₄⁺(aq) + OH⁻(aq) Kb = 1.76 × 10⁻⁵.One strategy for removing it is to raise the pH and "strip" the NH₃ from solution by bubbling air through the water.(a) At pH 7.00, what fraction of the total nitrogen in solution is NH₃, defined as [NH₃]/ ( [NH₃] + [NH₄⁺] )?