【Daily Question】Theoretical Foundation 2020.07.27
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Multiple-choice question: Adding some NH4Cl crystals to ammonia solution will cause ( ). A. The dissociation constant of NH3 in water increases. B. The degree of dissociation a of NH3 in water increases. C. The pH value of the solution increases. D. The pH value of the solution decreases. Answer: D. Hint: Extra rewards will be given to those who can explain the solution process; the answer can be found in the response
D. Ammonia is a base, while ammonium chloride is an acid; adding an acid to a base reduces the pH.