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5 Would a buffer made up of 0.050M HF and 0.100 M NaF have higher buffering capacity toward added acid or added base? Explain.

5 Would a buffer made up of 0.050M HF and 0.100 M NaF have higher buffering capacity toward added acid or added base? Explain.

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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5 Would a buffer made up of 0.050M HF and 0.100 M NaF have higher buffering capacity toward added acid or added base? Explain.
Transcribed Image Text:5 Would a buffer made up of 0.050M HF and 0.100 M NaF have higher buffering capacity toward added acid or added base? Explain.
Expert Solution
Step 1: Establishing the concept.

HF is a weak acid with a Ka value of 6.9 x 10-4 (pKa = 3.17)

And like any weak acid, it forms a good buffer with its salt with a strong alkali like NaOH, KOH etc

So  HF and NaF form a very good buffer system and the pH of this buffer system is given by the Henderson eqn

p H space equals space p K a space plus space log space left parenthesis space left square bracket F to the power of minus right square bracket divided by left square bracket H F right square bracket right parenthesis


Now for this buffer system, we have [F-] = 0.100M and [HF] = 0.050M

Therefore, the pH will be after plugging in the values

p H space space equals space 3.17 space plus space log left square bracket 0.1 M divided by 0.05 M right square bracket space space space space space space space space equals space 3.17 space plus space log left square bracket 2 right square bracket space space space space space space space space equals space 3.17 space space plus space 0.30 space space space space space space space space equals space 3.47



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