Sulphurous acid \( \left(\mathrm{H}_{2} \mathrm{SO}_{3}\right) \) has \( \mathrm{Ka}_{1}=1.7 \times 10^{-2} \) and \( \m…

Sulphurous acid \( \left(\mathrm{H}_{2} \mathrm{SO}_{3}\right) \) has
\( \mathrm{Ka}_{1}=1.7 \times 10^{-2} \) and \( \mathrm{Ka}_{2}=6.4 \) \( \times 10^{-8} \). The \( \mathrm{pH} \) of \( 0.588 \mathrm{~M} \mathrm{~H}_{2} \mathrm{SO}_{3} \) is........ (Round off to the nearest integer)

[JEE Main 2021, 16 Mar (Shift 2)]