why is it essential to have the inverse logarithm of the dissociation constant of the acid or base used close to the pH of the buffer prepared?
buffer solutions watch
- Thread Starter
- 18-04-2016 14:14
- 18-04-2016 17:52
It isn't essential, just desirable.
If pH = pKa, then [H+] = Ka, then Ka/[H+] = [A-]/[HA] = 1, i.e. [A-] = [HA], in which case it is just as good a buffer in the acid direction as the alkali direction.