Environmental Chemistry: Microscale Laboratory Experiments by Jorge G. Ibanez, Margarita Hernandez-Esparza, Carmen
By Jorge G. Ibanez, Margarita Hernandez-Esparza, Carmen Doria-Serrano, Arturo Fregoso-Infante, Mono Mohan Singh
This publication offers chemical analyses of the main urgent waste, toxins, and source difficulties for the undergraduate or graduate scholar. Its particular holistic strategy presents a great creation to conception in addition to a realistic laboratory guide detailing starting and complex experimental functions. It offers laboratory approaches at microscale stipulations, for minimal waste and greatest economic system.
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Additional info for Environmental Chemistry: Microscale Laboratory Experiments
Water up to the mark. Mix perfectly and pour the resulting solution into a 50-mL beaker. (a) Based on the known pKa values and the Henderson-Hasselbalch equation, calculate the pH of this solution. (b) Immediately after preparing the solution, measure its pH by placing the pH electrode inside the solution and reading the stabilized value. Remember that if the solution is allowed to rest for a long time, atmospheric CO 2 will dissolve in it and the pH values will be altered. 25 M HCI and fill it with the same acid solution.
6. SafetyMeasures The titrants should not come in contact with the skin or eyes because they may be corrosive. The student must consider all the safety measures normally taken when handling this kind of reactants. In case of spillage of an acid solution or of skin contact, wipe clean with a clean cloth and wash thoroughly and abundantly with water (sprinkle the table or surface with sodium bicarbonate). All of the residues generated in this experiment can be disposed of down the drain once they have been neutralized.
10. Using the theoretical approach, calculate the saturation concentration of dissolved oxygen under standard conditions. 22 2. Dissolved Oxygen in Water 11. Using the theoretical approach, explain how you would calculate the concentration of dissolved oxygen at other latitudes and at other temperatures. O. is measured with time. Additional Related Projects • Another experiment would be to add a small amount of a biodegradable organic substrate to an air-saturated water sample seeded with activated sludge and to measure the level of dissolved oxygen vs.