Problem: A buffer solution is prepared by mixing 150 mL of 0.100 M propionic acid (HC3H5O2, Ka = 1.3 x 10-5) and 400 mL of 0.0650 M potassium propionate. What is the pH of the solution? ( hint: keep track of volumes!)a. 5.13b. 6.20c. 4.55d. 4.31e. 4.82

FREE Expert Solution

For this problem, we are being asked to determine the pH when 150 mL of 0.10 M propionic acid (CH3CH2COOH) is mixed with 400 mL 0.0650 M potassium propionate (CH3CH2COOK) 

A solution that contains a weak acid and its conjugate base is a buffer solution. The pH of a buffer solution can be determined using the Henderson-Hasselbalch equation.

pH=pKa+log (conjugate baseweak acid)


Given solution:

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Problem Details

A buffer solution is prepared by mixing 150 mL of 0.100 M propionic acid (HC3H5O2, Ka = 1.3 x 10-5) and 400 mL of 0.0650 M potassium propionate. What is the pH of the solution? ( hint: keep track of volumes!)

a. 5.13

b. 6.20

c. 4.55

d. 4.31

e. 4.82