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You need to produce a buffer solution that has a pH of 5.09. You already have a solution that contains 10. mmol m m o l (millimoles) of acetic acid. How many millimoles of acetate (the conjugate base of acetic acid) will you need to add to this solution? The pKa p K a of acetic acid is 4.74.

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The number of millimoles of acetate (the conjugate base of acetic acid) needed is 3162.28 mmol

What is pH?

This is simply a measure of the acidity / alkalinity of a solution.

The pH measures the hydrogen ion concentration while the pOH measures the hydroxide ion concentration

pH for buffer solution

pH = pKa + Log[conjugate]/[acid]

How to determine the number of millimoles of acetate (conjugate )

From the question given above, the following data were obtained:

  • pH = 5.09
  • pKa = 4.74
  • Millimole of acid = 10 mmol
  • Millimole of conjugate =?

pH = pKa + Log[conjugate]/[acid]

5.09 = 4.74 + Log[conjugate]/ 10

Collect like terms

5.09 - 4.74 = Log[conjugate] / 10

0.35 = Log[conjugate] / 10

Cross multiply

Log[conjugate] = 0.35 × 10

Log[conjugate] = 3.5

Take the anti-log

[conjugate] = anti-log 3.5

[conjugate] = 3162.28 mmol

Thus, the number of millimoles of acetate (the conjugate base of acetic acid) needed is 3162.28 mmol

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