A buffer was prepared by adding 2.4 g of ammonium nitrate to 100.0 mL of 0.30 M aqueous ammonia (K_b = 1.8 × 10^-5).To this solution was then added 10.0 mL of 0.30 M aqueous sodium hydroxide,which caused a pH change of ________. A)3.0 pH units B)0.30 pH units C)0.90 pH units D)0.09 pH units E)zero

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Quizplus · Accepted Answer

The addition of a strong base (NaOH) to the buffer solution causes a slight change in pH due to the buffer's ability to resist changes in pH. The calculation involves the buffer equation and the small amount of strong base does not significantly alter the pH, leading to a minimal change, hence option D is correct.

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