Is an ammonia-ammonium chloride solution a buffer solution?
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Ammonia is injected at the top of the atmospheric and vacuum distillation tower to adjust the pH value. Some sources indicate that the pH curve resulting from ammonia injection is relatively steep within a certain pH range; in other words, when ammonia neutralizes the acidic water containing HCl at the tower top, even a small excess of ammonia leads to significant changes in the pH value. It is also stated that at pH 5.5–9, excess ammonia and the resulting ammonium chloride form an ammonia-ammonium chloride buffer solution; in other words, to increase the pH of the solution, it is necessary to inject an increased amount of ammonia. These two situations are contradictory; can any expert explain this?
I wasn’t proficient in these skills before, so I reviewed my high school knowledge again; it turns out that significant pH changes and the creation of buffers occur within different pH ranges on the same pH curve. I share this with everyone as a source of encouragement.