Question

1.Suppose it is desired to maintain the pH of a solution at 4.2 using only acetic...

1.Suppose it is desired to maintain the pH of a solution at 4.2 using only acetic acid and sodium acetate, describe in detail how this could be done. Specify the concentration of each reagent needed.

2.Can you suggest how a solution of acetic acid- sodium acetate could be maintained at pH = 5.2? Specify the concentration of each reagent needed.

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Homework Answers

Answer #1

1. Acetic acid (HAc) undergoes dissociation as below:

HAc (aq) <====> Ac- (aq) + H+ (aq)

NaAc is the source of Ac-; find the ratio of concentrations of Ac- and HAc using the Henderson-Hasslebach equation. We can find out the ratio of the concentrations of the acid and the conjugate base.

pKa of HAc is 4.75; use the Henderson equation as below:

pH = pKa + log [Ac-]/[HAc]

===> 4.2 = 4.75 + log [Ac-]/[HAc]

===> -0.55 = log [Ac-]/[HAc]

===> [Ac-]/[HAc] = antilog (-0.55) = 0.28

===> [Ac-] = 0.28*[HAc]

We need to know the total acetate concentration to proceed further.

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