A buffer was prepared by adding 2.4 g of ammonium nitrate to 100.0 mL of 0.30 M ammonia. To this solution was then added 10.0 mL of 0.15 M HCl. Calculate the change in pH of the buffer. Here are the options: A) 2.64 B) -2.64 C) 0.00 D) -0.05