recycling aluminum Results and Discussion

recycling aluminum Results and Discussion - Results and...

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Results and Discussion: Purpose: To observe the chemical recycling of aluminum as opposed to the mechanical recycling of aluminum. Observations and Data: Week 1: When heating a 1.302g sample of Al in 66mL of 1.4 M KOH: -Bubbles began gathering on Al -Smoke began forming above the solution -Solution began bubbling violently -Solution grew very dark -Al began dissolving -Solution turned black -Bubbles eventually stopped The chemical reaction that takes place is: 2 Al (s) + 2 KOH (aq) + H 2 O (l) 2 + K (aq) + 2 ( ) Al OH 4 - (aq) + 3 H 2 (g) After filtering out the dark solution, the filtered solution was clear. When adding 26mL of 9 M H 2 SO 4 in increments of 6.6mL while gently heating and stirring: -Solution turned white -Solution began to harden into a solid Al(OH) 4 (aq) + + H (aq) Al(OH) 3 (s) + H 2 O (l)
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-After mixing and stirring more 9 M H 2 SO 4 into the solution, the solution eventually turned clear again Al(OH) 3 (s) + 3 + H (aq) + Al3 (aq) + 3 H 2 O (l) When clear filtrate was put in ice-bath: -Crystals began forming along the bottom of the beaker + + + + - + -→ ( )
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  • Fall '09
  • Chemistry, Aluminium, 2 K, 1.4 m

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