3. Calculate the pH value of Buffer Solution Henderson-Hasselbalch Equation a buffer solution made up of a weak acid Ha and its conjugate base A. The acid-ionization equilib- rium Is HA(ag H(ag)t A(ag and the acid-ionization constant is Ka-HIATHAI3. Calculate the pH value of Buffer Solution Henderson-Hasselbalch Equation: A buffer solution made up of a weak acid HA and its conjugate base A- . The acid-ionization equilib￾rium is HA(aq) H+ (aq) + A- (aq) and the acid-ionization constant is Ka = [H+ ][A- ]/[HA]