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Hydrazoic acid has an intolerable pungent odor and can cause severe eye irritation, cough, headache, a drop in blood pressure, weakness and collapse, but it is relatively safe to handle in solution. If a solution of 0.073 M Hydrazoic acid (HN3) is found to be 3.41% ionized, determine the pH of the solution and the Ka of the Hydrazoic acid.