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

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

these nuts