lab 3 aluminum - Results and Discussion: Purpose: To...

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Results and Discussion: Purpose: To prepare a theoretical yield of 23 g of alum (from aluminum, KOH, and H2SO4). Chemical recycling of aluminum and its conversion to alum were observed in this experiment. A standard Coca-Cola soda can was the source of aluminum. The aluminum was processed several times, having reacted with different reagents and being heated. Small pieces of aluminum reacted with an aqueous solution of potassium hydroxide: 2Al (s) + 2KOH (aq ) + 6H 2 O (l) 2K + (aq) + 2Al(OH) 4 - (aq) +3H 2(g) This reaction took place in a 600 mL beaker that was on an active heating plate. The reaction was at an end once hydrogen gas bubbles stopped forming—an indication that the reaction is complete. The reaction was complete about after 15 minutes of reacting, at which point there were no gas bubbles in the black solution. This reaction produced tetrahydroxoaluminate(III) anion [Al(OH) 4 - ], which is then reacted with sulfuric acid: Al(OH) 4 - (aq) + H + (aq) Al(OH) 3(s) + H 2
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This note was uploaded on 04/14/2008 for the course CHEM 007 taught by Professor Staff during the Fall '07 term at Cornell University (Engineering School).

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lab 3 aluminum - Results and Discussion: Purpose: To...

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