2. Alkalinity is related to the buffering capacity of an aqueous solution containing an acid and its conjugate base which can be understood using the Henderson- Hasselbalch equation, as follows: pH = pka + log [base]/[acid] a Calculate the pH of a buffer solution that is 0.050 Min benzoic acid (C6H5COOH) and 0.150 M in sodium benzoate (C6H5COONa). Note: Ka (benzoic acid) = 6.5 x10-5. Outline any assumptions or simplifications in your calculation. b What will happen to the final pH of the solution above if 0.075 moles of Fe2+ species are added, where the following complex formation reaction occurs? The value of the formation constant is given as follows: K (Fe(C6H5COO)2) = 1.5x1010 . Fe 2 (aq) + 2 C6H5COO (aq) Fe 2 (C.HSCOO)2 (aq)