Is the pH of 100 mL of an aqueous solution containing substantial and approximately equal con- centrations of sodium hydrogensulfite and sodium sulfite closest to a pH of 2, 3, 4, 5, 6, 7, 8, 9, 10, none of these, or cannot be determined? Justify your choice. Ka1 = 1.3 x 10-2 and Ka2 = 6.2 x 10-8 for sulfurous acid.