Question

How does the dilution factor affect a buffer solution?

Answer 1

Diluting a buffer solution would decrease its buffer capacity.

Explanation:

Diluting a buffer solution would decrease its buffer capacity.

Let us take a look on the following example in the table below:

You can easily notice that the change on the pH is more important when the concentrations of the acid and conjugate base are diluted.

Here is a video that explains in details the buffer solution:
Acid - Base Equilibria | Buffer Solution.