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On page 159 in the course reader it talks about salts as acids and bases. Certain ions display acidic or basic characteristics after dissolution. In the example you give, NH4Br dissociates into NH4+ and Br- in solution. Because NH4+ is an acid, it lowers the pH of the solution.
If you separate the compound, you'll receive NH4+ and Br-. Thus, the chemical equation will come out to be NH4+ + H20 -> NH3 + H3O+. Therefore, since NH4+ is a strong acid, the pH will be below 7, for acids are solutions with pH less than 7.
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