The simple way.
What is a buffer? It is a weak acid and a salt of the weak acid OR a weak base and a salt of the weak base. So you have SnF2 in the problem. That is a salt. All you need to do is to look at the choices Anything other than HF isn't right.Besides, HF is the ONLY weak acid in the list of choices.
HCl doesn't have a Ka listed because it is a strong acid (100% ionized). NaOH, likewise, is a strong base and it is completely ionized.
Which of the following would for a buffer if added to 250.0 mL of .150 M SnF2?
a).100 mol HCl
b).060 mol HCl
c).040 mol HCl
d).040 mol NaOH
e).040 mol HF
1 answer
1 answer