COnenta uonapa2. Acetic acid and a salt containing its conjugate base, such as sodium acetate, form buffer solutionsthat are effective in the pH range 3.7-5.7.(a) In resisting a pH change, which buffer component would react with NaOH? Explain.(b) What happens to the buffer activity when this component is exhausted?

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Asked Nov 14, 2019
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COnenta uonapa
2. Acetic acid and a salt containing its conjugate base, such as sodium acetate, form buffer solutions
that are effective in the pH range 3.7-5.7.
(a) In resisting a pH change, which buffer component would react with NaOH? Explain.
(b) What happens to the buffer activity when this component is exhausted?
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COnenta uonapa 2. Acetic acid and a salt containing its conjugate base, such as sodium acetate, form buffer solutions that are effective in the pH range 3.7-5.7. (a) In resisting a pH change, which buffer component would react with NaOH? Explain. (b) What happens to the buffer activity when this component is exhausted?

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Expert Answer

Step 1

Solutions that resist a change in the pH on addition of an acid or a base is called buffer solution.

a)

A buffer solution is made up of weak acid (HA) and its salts(NaA).  The pH of a solution is calculated using Henderson-Hasselbalch equation:

conjugate base
pH-pKa+log
weak acid
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conjugate base pH-pKa+log weak acid

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Step 2

Sometimes a solution that is technically a buffer does NOT resist changes in pH. This occurs when so much acid or base are added to the buffer that they become the excess reactant.When a strong base, NaOH reacts with acetic acid, it produces acetate ion and water. Addition of NaOH does not change the pH significantly. The addition of a strong base (NaOH) to a buffer solution decr...

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