A 70.0 mL solution of 0.135 M sulfurous acid (H2SO3) is titrated with 0.135 M NaOH. The pKa values of sulfurous acid are 1.857 (pKal) and 7.172 (pKa2). Calculate the pH at the first equivalence point. pH = Calculate the pH at the second equivalence point. pH =

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