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Investigation of the Carbonate /Bicarbonate system.
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Letort Vanessa Student number: 2029474 HEV 4031 Kershaw Paul ALKALINITY OF AQUEOUS SYSTEMS INVESTIGATION OF THE CARBONATE /BICARBONATE SYSTEM AIMS This laboratory session should enable the operator: 1. To define and understand the importance of alkalinity of aqueous systems. 2. To determine what constitutes a buffer system. 3. To understand the buffering capacity of chemical species such as carbonate and bicarbonate. 4. To gain knowledge of the carbonate/bicarbonate system and its environmental importance in water bodies. 5. To determine carbonate and bicarbonate equivalence points. 6. To practice two different titrations, pH and colour indicators titrations. 7. To calculate the concentration of carbonate and bicarbonate in an aqueous system. 8. To compare accuracy of both titrations. 9. To investigate, identify, and assess error limits associated with those procedures. INTRODUCTION Carbon is present in natural waters as the carbonate ion, the bicarbonate ion, and as dissolved carbon dioxide. Carbonate ions come from the weathering of carbonate rocks, leaching in surface waters. Carbon dioxide is present as a gas in the atmosphere....
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