Calculate the ratio [sodium fluoride]/ [hydrofluoric acid] to get a pH of 3.5 (you are making a buffer solution)

Chemistry for Today: General, Organic, and Biochemistry
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Author:Spencer L. Seager, Michael R. Slabaugh, Maren S. Hansen
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Chapter9: Acids, Bases, And Salts
Section: Chapter Questions
Problem 9.116E: a.Calculate the pH of a buffer that is 0.1M in lactic acid, C2H4(OH)COOH, and 0.1M in sodium...
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Calculate the ratio [sodium fluoride]/ [hydrofluoric acid] to get a pH of 3.5 (you are making a buffer solution)

Expert Solution
Step 1

Concept introduction-

For preparation of buffer solution mixture of weak acid and its conjugate base is required.

Using Handerson Hasselbalch equation pH of buffer solution can be determined.

Chemistry homework question answer, step 1, image 1

Where,

pH = negative logarithm of H+ ion concentration.

pKa = negative logarithm of Ka (Ka=acid dissociation constant)

[Salt]=concentration of salt formed in reaction.

[Acid]= concentration of weak acid reacted in reaction.

Step 2

Chemistry homework question answer, step 2, image 1

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