Consider the Buffer Pair, NH₄Cl/NH₃

Multiple Choice

Consider the buffer pair, NH₄Cl/NH₃. What can be stated about the relative proportions of this buffer pair if the pH of an aqueous solution of this pair is adjusted to 12.00 and the p K _a for NH₄⁺ equals 9.25?

A) This buffer solution contains relatively more NH₄⁺ than NH₃.
B) This buffer solution contains relatively more NH₃ than NH₄⁺.
C) This buffer solution contains equal concentrations of NH₄⁺ and NH₃.
D) More information is needed to determine the relative proportion of each member.