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You need to produce a buffer solution that has a pH of 5.19. You already have...

You need to produce a buffer solution that has a pH of 5.19. You already have a solution that contains 10. mmol (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 of acetic acid is 4.74. Express your answer numerically in millimoles.

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Answer #1

The pH of a buffer solution can be calculated using the Henderson-Hasselbalch equation

pH = pKa + log([acetate]/[acetic acid])

You should use the concentration of acetate/acetic acid, but since we don't know the volume of the solution, it should be okay to use millimoles instead, since the ratio will be the same.

5.19 = 4.74 + log ([acetate]/[acetic acid])

0.45 = log ([acetate]/[acetic acid])

10^0.45 = ([acetate]/[acetic acid])

2.8 = (millimoles acetate/10 millimoles acetic acid)
28 = millimoles acetate

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