In an acid-base titration, 10.0 mL (VB) of Na2SO3 (Ka1(H2SO3) = 1.4×10-2; Ka2(HSO3-) = 6.5×10-8) 0.1 M (CB) are titrated at the 2nd equivalence point (EP2) with 20.0 ml (VA) of HCl 0.1 M (CA). Calculate (to two decimal places) the pH of the solution at the 2nd equivalence point.
