Which of the following solutions result in a buffer ?

Question

Which of the following solutions result in a buffer ?



a) 0.050 L of 0.250 M CH3COOH + 0.100 L of 0.250 M NaOH


b) 0.100 L of 0.250 M CH3COOH + 0.050 L of 0.250 M HCl


c) 0.050 L of 0.250 M CH3COONa + 0.100 L of 0.250 M HCl


d) 0.100 L of 0.250 M CH3COONa + 0.050 L of 0.250 M HCl

Answer 1

d only - this results in half of the CH3COONa being turned into CH3COOH.

In all the others, HCl or NaOH is in excess, or there is no base.