Question

Which of these reactions would result in a buffer solution?

A. Reacting 100 mL of 1 M of NaOH with 200 mL of 1 M HCl.
B. Reacting 100 mL 1 M of HCl with 200 mL of CH3NH2.
C. Reacting 100 mL of 1 M NaOH with 200 mL of 1 M HF.
D. Reacting 100 mL of 1 M HCl with 200 mL of 1 M HF.

Answer 1

Reacting 100 mL of 1 M NaOH with 200 mL of 1 M HF would result in a buffer solution because it creates a mixture of a weak acid (HF) and its corresponding salt (NaF), which can resist changes in pH.

Step-by-step explanation:

Among the given options, the reaction that would result in a buffer solution is reacting 100 mL of 1 M NaOH with 200 mL of 1 M HF. This is because HF (hydrofluoric acid) is a weak acid, and by reacting it with NaOH (a strong base), you would produce NaF, which is the salt of the weak acid. This combination of a weak acid and its salt can act as a buffer solution, resisting changes in pH upon the addition of small amounts of acids or bases. The other reactions would not result in a buffer because there is no combination of a weak acid or base with its conjugate salt.