A 25.0-mL sample of 1.00 M NH₃is titrated with 0.15 M HCl. What is the pH of the solution after 15.00 mL of acid have been added to the ammonia solution? K_b = 1.8 × 10⁻⁵ A)10.26 B)9.30 C)9.21 D)8.30 E)8.21

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Quizplus · Accepted Answer

The correct answer is A because the pH of the solution after 15.00 mL of acid have been added to the ammonia solution is 10.26. This is because the ammonia solution is a weak base and the hydrochloric acid is a strong acid. When the two solutions are mixed, the hydrochloric acid will react with the ammonia to form ammonium chloride, which is a weak acid. The resulting solution will have a pH that is greater than 7, which indicates that it is basic.

A 250-ML Sample of 1