Which of the following gives a buffer solution when equal volumes of the two solutions are mixed?a. 0.20 MHF and 0.10 MNaOH. b. 0.10 MHF and 0.10 MNaOH. c. 0.10 MHF and 0.10 MNaF. d. 0.10 MHCl and 0.20 MNaF.

a. 0.20 M HF and 0.10 M NaOH.

c. 0.10 M HF and 0.10 M NaF

d. 0.10 M HCl and 0.20 M NaF.

Explanation:

A buffer solution consists of a weak acid and its conjugate base, or of a weak base and its conjugate acid.

In this case, HF is the weak acid and F⁻ is its conjugate base.

Let's go case-by-case:

a. 0.20 M HF and 0.10 M NaOH.

b. 0.10 M HF and 0.10 M NaOH.

c. 0.10 M HF and 0.10 M NaF.

d. 0.10 M HCl and 0.20 M NaF.

The correct answers are A), C) and D).

it's c (engineer's do their work with mechanical stuff not on any living being)