A Buffer Is Prepared by Adding 100 ML of 0

Multiple Choice

A buffer is prepared by adding 100 mL of 0.50 M sodium hydroxide to 100 mL of 0.75 M propanoic acid. Is this a buffer solution, and if so, what is its pH?

A) It is a buffer, pH > pK _a of propanoic acid.
B) It is a buffer, pH < pK _a of propanoic acid.
C) It is a buffer, pH = pK _a of propanoic acid.
D) It is a buffer, pH = pK _b of sodium propanoate.
E) Since sodium hydroxide is a strong base, this is not a buffer.