At half-neutralisation of a weak acid with a strong base, what is the relationship between pH and dissociation constant (K_(a)) of the weak acid ?

At half-neutralisation of a weak acid with a strong base, what is the

1.	At half-neutralisation of a weak acid with a strong base, what is the relationship between pH and dissociation constant (K_(a)) of the weak acid ?
Answer» SOLUTION :at HALF- NEUTRALISATION, `PH = pK_(a)`.