(a) To a 100 mL volumetric flask were added 40.0 mL of a 0.500 M aqueous solution of sodium dihydrogenphosphate, 4.80 g of solid sodium monohydrogenphosphate monohydrate, and 2.00 mL of 6.00 M HCl. The flask was filled to the calibration mark with water, and the contents were thoroughly mixed. What were the equilibrium concentrations of H+, Na+, H2PO-4 , and HPO-2 in the resultant solution? Ka1 = 7.1x10-3, Ka2 = 6.3x10-8, and Ka3 = 4.2x10-13 for phosphoric acid?
(b) Was the resultant solution in the volumetric flask in Part a a buffer solution?