Sulfurous acid,

CHEMISTRY · Subjective · A Level · Chemistry · Acids and bases · Acids and bases

Problem

Sulfurous acid,

H_2SO_3

, has

K_{a1} = 1.5\times10^{-2}

and

K_{a2} = 6.3\times10^{-8}

. A

50.0\,\text{mL}

portion of

0.100\,\text{M}

H_2SO_3

is titrated completely to the second equivalence point with

0.100\,\text{M}

NaOH. Determine the pH of the solution at this second equivalence point.