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NTA Abhyas JEE Main2020ChemistryIonic EquilibriumPractice

The average concentration of SO 2 in the atmosphere over a city on a certain day is 10 ppm, when the average temperature is 298 K. Given that average solubility of SO 2 at 298 K is 1.3653 M atm -1 and pK a of H 2 SO 3 is 1.92, estimate the pH of rain on that day.

Correct answer

4.86

Step-by-step solution

Partial pressure of SO 2 in air = 10 - 5 atm [SO 2 ] = 1.3653 x 10 - 5 M [H 2 SO 3 ] = 1.3653 x 10 - 5 M H 2 SO 3 ⇌ H + + HSO 3 - H 2 SO 3 at low concentration is fully ionised. [H + ] = 1.3653 x 10 - 5 pH = - log 1.3653 x 10 - 5 = 5 - log 1.36 = 4.86

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