The average concentration of in the atmosphere over a city on a certain day is 10 ppm

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

Problem

The average concentration of

\text{SO}_2

in the atmosphere over a city on a certain day is 10 ppm, when the average temperature is 298 K. Given that the solubility of

\text{SO}_2

in water at 298 K is

1.3653 \text{ mol litre}^{-1}

and the

pK_a

\text{H}_2\text{SO}_3

is 1.92, estimate the pH of rain on that day. (IIT 2000)