Determine the pH of a buffer solution that has a pyridine concentration of 0.20M, and the concentration of the pyridinium ion

is 0.40 M, knowing that the apparent dissociation constant of pyridine is 1.50 x 10-9.

What is the pH of a buffer solution that is 0.15M pyridine and 0.10M pyridinium bromide?

Calculate the pH of a buffer that is 0.125 M pyridine (B) and 0.135 M pyridinium chloride (HB+).

Calculate the pH of a buffer that is 0.105 M pyridine (pKb=5.25)and 0.265 M pyridinium chloride