Question

Which of the following combinations can be used to make a buffer?
a) 0.50 M HF and 0.20 M NaF
b) 0.50 M HF and 0.50 M NaOH
c) 0.50 M HF and 0.50 M HCl
d) 0.50 M HCl and 0.50 M NaF