another chem brain fart

[phatj]

A PABA solution is titrated with 0.1000 M NaOH. What is the pH at the halfequivalence
point? Explain (the best explanations will use equation(s) to back up
their answers).

half equivalence point is at 0.0500 M NaOH by definition.

how do i find the pH when 0.0500M naoh has been added?

 

[6shiw1]

ph = -log (mol H+)/L

How do you do this problem without volume for the actual solution?

 

[Ika]

PABA solution?

 

[Siva]

Hendersen Hasselbach

ph = pka + log[A-]/[HA]

I think half equivalence point would just be pH = pka + log(.5)