A Solution Is Prepared by Dissolving 0

Multiple Choice

A solution is prepared by dissolving 0.23 mol of hydrazoic acid and 0.27 mol of sodium azide in water sufficient to yield 1.00 L of solution. The addition of 0.05 mol of NaOH to this buffer solution causes the pH to increase slightly. The pH does not increase drastically because the NaOH reacts with the __________ present in the buffer solution. The K_a of hydrazoic acid is 1.9 × 10^-5.

A) H₂O
B) H₃O⁺
C) azide
D) hydrazoic acid
E) This is a buffer solution: the pH does not change upon addition of acid or base.