chem lab 3 - Chemical Changed with Aluminium by AlReem...

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Chemical Changed with Aluminium by AlReem Al-Nabti Lab instructor: Noreen Rizvi October 5th, 2009 Purpose
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The aim of this experiment is to change Aluminium chemically, by converting it to alum [KAL(SO4)2.12H2O]. The implementation of proper lab techniques was integral in order to produce as much alum as possible. Results and Discussion An aluminum can was cut up using scissors and 1.00 g was measured using a balance. These strips were then added to 51.0 cm 3 of 1.4 M KOH and was heated gently under a fume hood while stirring with a rod. Hydrogen gas started to bubble and the clear solu- tion turned black as the Aluminum metal strips melted and the reaction went to comple- tion as gas stopped being produced. Then the solution was filtered using gravity filtra- tion. The black residue was disposed of and the resulting filtrate turned clear. 2Al (s) + 2KOH (aq) + 6H 2 O (l) --> 2K + (aq) + 2Al(OH) 4 - (aq) + 3H 2(g) Then 5.0 mL of 9.0 M H2SO4 was added to the clear solution. A white precipitate (Alu- minum Hydroxide) was formed. Al(OH) 4 - (aq) + H + (aq) --> Al(OH) 3 (s) + H2O(l) The remaining 15.0 mL of 9.0 M H2SO4 was added to the solution very slowly whilst continually stirring with a rod and gently warming the solution. The white solid precipit-
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