3 Recycling Aluminum Results and Discussion

3 Recycling Aluminum Results and Discussion - Results and...

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Results and Discussion: The experiment was implemented in order to describe the process by which aluminum is recycled into alum. This was done in a series of chemical reactions in order to obtain the highest possible percent yield and the purest form of Alum. The reactions used are as follows: Aluminum was mixed with aqueous potassium hydroxide and heated: 2Al( s ) + 2KOH( aq ) + 6H 2 0( l ) 2K + ( aq ) + 2Al(OH) 4 - ( aq ) + 3H 2 ( g ) (1) This caused the separation of aluminum from any contaminates and also caused the aluminum to melt into an aqueous solution with the KOH. This reaction released hydrogen gas. After heating and filtering the solution the product of tetrahydroxoaluminate(III) anion was mixed with a small amount of sulfuric acid and heated: Al(OH) 4 - ( aq ) + H + ( aq ) AL(OH) 3 ( s ) + H 2 0( l ) (2) AL(OH) 3 ( s ) + 3H + ( aq ) Al 3+ ( aq ) + 3H 2 0( l ) (3) The reaction of sulfuric acid and the tetrahydroxoaluminate first turned into a gelatin white solution, but through continuous srtirring, became a clear solution once again.
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