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PS4_Sp10 - CEE 320 Environmental Engineering Assignment#4...

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CEE 320 Assignment #4 Environmental Engineering complete by W 17 February Note: You do not have to work the problems in order (we will not be covering the topics corresponding to the order in which they are listed here). PROBLEMS: 1. Question 2-27 in textbook 2. Question 2-29 in textbook 3. Question 2-58 in textbook 4. Microbes and ammonia Microorganisms are grown in laboratory bioreactors to study their effectiveness in destroying hazardous organic compounds. Ammonium chloride (NH 4 Cl) is a soluble salt that is often added to the reactor to provide a source of the nutrient nitrogen to the microorganisms. Consider a 2 L closed vessel that is half filled with otherwise pure water. A quantity of 500 mg of ammonium chloride is completely dissolved in the water. Some of the ammonium ions (NH 4 + ) dissociate to form ammonia (NH 3 ) and liberate a proton (H + ). Some of the ammonia molecules escape into the gas phase. (a) Set up a system of equations that you could use to solve for the equilibrium pH of the water.
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