You Have 500

Multiple Choice

You have 500.0 mL of a buffer solution containing 0.30 M ammonia (NH₃) and 0.20 M ammonium chloride (NH₄Cl) . What will the pH of this solution be after the addition of 20.0 mL of 1.00 M HCl solution? [K_b = 1.8 × 10^-5]Hint: Adding HCl will change the amounts of both the acid and the base. Calculate the pH based on the new amounts.

A) 4.74
B) 9.26
C) 9.58
D) 9.20
E) 9.29