Question

Calculate the pH of a buffer system containing 1.0 M CH3COOH and 1.0 M CH3COONa.
a) Using the Henderson-Hasselbalch equation
b) Making no assumptions about quantities (use the quadratic equation)
c) Compare and explain your results in a) and b)
d) What is the pH of a buffer system after the addition of 0.10 moles of gaseous HCl to a 1.0 L of the solution? Assume that the volume of the solution does not change when the HCl is added.
The Ka of CH3COOH is 1.8x10^-5

Answer 1

Hello,

Please find the detailed solution and explanation of your question below.

ANSWER: a) pH = 4.7447

b) pH = 4.74496

c) The difference is negligible and occurs due to the approximation in part a, refer to the picture below.

d) pH = 4.6576

Explanation: The detailed solution and explanation are shown in the picture below:

I hope, this answer helps you to better understanding the buffer process.

This is a really good question, feel free to ask us any doubt regarding the question.

Thank you.