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Calculate the pH of rain based on the water being equilibrated with air containing an SO2...

  1. Calculate the pH of rain based on the water being equilibrated with air containing an SO2 concentration of 5 ´ 10–9 atm. You can ignore the presence of CO2. SO2 dissolves giving H2SO3, with a Henry’s constant of 1 mol/L-atm. The first acid dissociation constant K1 for H2SO3 is 1.7 ´ 10–2.

Hint: You may solve this problem analytically or using a log C-pH diagram, the same way that you computed the pH of pure rainwater due to presence of carbon dioxide.                 (4 points)

Engineering   Chemical-Engineering   
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