Question
Asked Sep 15, 2019
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If the acetate to acetic acid ratio of a solution is five, what is its pH? The pKa of acetic acid is 4.75.

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Expert Answer

Step 1

We have to determine the pH of a solution which has both acetic acid and acetate ion and the acetate to acetic acid ratio of a solution is five.

The pKa of acetic acid is 4.75.

Step 2

A buffer solution has a mixture of a weak acid and its conjugate base or vice-versa. Thus, the given solution is buffer solution as acetic acid is a weak acid and acetate ion is its conjugate base.

The Henderson-Hasselbalch equation is used to determine the pH of a buffer solution

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Henderson-Hasselbalch eqaution - pHpK [A'] [HA where [A concentration of conjugate base [HA] concentration of acid

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Step 3

Now calculate the pH of the given solution using the given data-

...
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pH pK gCH,COO] [CH,CООН] pH 4.75 log (5) = 4.75 +0.698 . pH 5.45

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