A Solution Is Prepared by Dissolving 0

Multiple Choice

A solution is prepared by dissolving 0.23 mol of nitrous acid and 0.27 mol of sodium nitrite 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 nitrous acid is 4.5 × 10^-4.

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