Calculate the pH of the Buffer Solution

What is the pH of a 1.41 L buffer solution consisting of 0.149 M butanoic acid and 0.288 M sodium butanoate after the addition of 0.061 moles of NaOH?

Is the addition of NaOH significant in changing the pH of the solution?

Answer:

pH = 5.31

Hello there!

Let's dive into calculating the pH of the buffer solution with the given components and the addition of NaOH. The initial pH of the solution with 0.149 M butanoic acid and 0.288 M sodium butanoate is 5.10.

After adding 0.061 moles of NaOH, the new concentrations of butanoic acid and sodium butanoate are 0.106 M and 0.331 M, respectively. This results in a new pH of 5.31, indicating a slight increase of 0.21 in pH.

Therefore, the addition of NaOH has a noticeable impact on the pH of the buffer solution, causing a slight shift towards a more basic environment.

Best regards!