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23 Nov 2019

What are the concentrations of acetic acid and sodium acetate in a 0.4 M acetate buffer, pH 5.2 ? The pKa of acetic acid is 4.77.

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Lelia LubowitzLv2
20 Sep 2019
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Related questions


What ratio of sodium acetate to acetic acid should be used to prepare a buffer with pH = 4.5? (hint: what is the pKa of acetic acid? What equation incorporates pH, pKa, and the ratio?)

1.6 parts sodium acetate to 1.0 part acetic acid.
0.20 parts sodium acetate to 1.0 part acetic acid.
0.57 parts sodium acetate to 1.0 part acetic acid.
We cannot determine the pH of the buffer solution unless we know the actual concentrations of the buffer components.

Question 3. ( 3 points )

Calculate the pH of the following solutions.

a. 0.02 M acetic acid , Ka = 1.7 x 10-5

b. 0.02 M ammonia , Kb = 1.8 x 10-5

c. 0.2 M acetic acid and 0.1 M sodium acetate, pKa for acetic acid = 4.77

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