Which of the following mixtures, with each component present at a concentration of .1m has a ph closest to 7? -hclo and naclo-hno3 and nano3-ch3cooh and nach3coogiven: pkas 3.2e-8, large, 2e-5, 4e-4 respectively

HClO/NaClO  

Explanation:

HClO;          Kₐ = 3.2 × 10⁻⁸

HNO₃;         Kₐ = large

CH₃COOH; Kₐ = 2 × 10⁻⁵

The most effective buffer will contain an acid with a pKₐ close the desired pH.

The buffer pair HClO/NaClO is the closest match.

pH = pKₐ = -log (3.2 × 10⁻⁸) = 7.49.

HNO₃/NaNO₃ will give pH ≈ 1

CH₃COOH/CH₃COONa  will give a pH closer to 4.7

"the periodic table is arranged in order of atomic number."