Chapter 21, Problem 21.86QP

Interpretation Introduction

Interpretation:

pH of the rain water should be determined. Equilibrium constant for the preceding reaction is given.

Concept Introduction:

• pH is the abbreviation of potential of hydrogen and it is a numerical scale used to specify the acidity and basicity of an aqueous solution.

$\text{pH= -log}\left[{\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\right]$

• Partial pressure is the pressure which the gas would have if it alone occupied the volume.
• ppm (parts per million) means the number of parts of substance per $\text{1,000,000}$ parts
• Equilibrium constant ( ${\text{K}}_{\text{C}}$): It is the ratio of product of product concentration raised to powers of their coefficient to product of reactant concentration raised to powers of their coefficient.

  For a general reaction $\text{aA+}\text{}\text{}\text{}\text{bB}\rightleftarrows \text{cC}\text{+}\text{dD}$,

${\text{K}}_{\text{C}}\text{=}\frac{{\left[\text{C}\right]}^{\text{c}}{\left[\text{D}\right]}^{\text{d}}}{{\left[\text{A}\right]}^{\text{a}}{\left[\text{B}\right]}^{\text{b}}}$ c, d, a and b are the co-efficient.

To determine: partial pressure of sulfur dioxide in the troposphere.