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1. Calculate the change in pH of rainwater resulting from an increase in the Pressure of CO2 from 10^-3.5 atm to 10^-3.0 atm due to fossil fuel emissions. 2. Suppose the gas above the soda in a bottle of a soft drink is pure CO2 at a pressure of 2 atm. a. Estimate the pH of the soda. b. Calculate C_T, the total dissolved inorganic carbon. 3. Nitrogen in a wastewater treatment plant is in the form of ammonia and ammonium ion and has a total concentration of 7.1 x 10^-4 M (KH for NH3 is 57 M/atm; pKa of NH4^+ is 9.26). a. Find the fraction of the nitrogen that is in the ammonia (NH3) form (and hence strippable) as a function of pH. Include a table AND a graph. b. If the wastewater pH is raised to 10 and the atmospheric ammonia partial pressure is 5.0 x 10^-10 atm, what would be the equilibrium concentration of total nitrogen in the wastewater after air stripping?

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