Question

Which of the following solution cannot act as a buffer?
(a) NaH₂PO₄ + H₃PO₄
(b) CH₃COOH+CH₃COONa
(c) HCl + NH₄Cl
(d) H₃PO₄ + NaH₂PO₄

Answer 1

I think (C) HCl+NH4Cl

Answer 2

Answer:

The correct answer is (c) HCl + NH₄Cl.

Explanation:

For being a buffer, a solution must contain a weak acid( or base) and a salt having the conjugate of that weak acid or base.

In the given option, HCl and NH4Cl , HCl is a strong acid and therefore this solution cannot act as a buffer.

Buffers are solutions that resist the change in pH even when acids or bases are added to them.