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Discussion Experiment 16

Discussion Experiment 16 - :SynthesisofAlum...

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Discussion Experiment 16: Synthesis of Alum In this experiment we synthesized a aluminum compound, KAl(SO 2 ) 12H 2 O or Alum,  from aluminum foil. We then did qualitative analysis of alum to check for the presence of sulfate  ions, aluminum ions, potassium ions and water. We also set up three different ways of making  crystals which are growing alum crystals from a seed crystal, by layering, and by vapor diffusion.  We will be observing the growth for the next two weeks.  In part 1 of the experiment, we added KOH to the pieces of aluminum foil in the flask and  the solution turned milky white, bubbled, and the following reaction took place:  2Al (s) + 2KOH(aq) + 2H 2 O (l) --> 2KAlO 2  (aq) + 3H 2  (g) The hydrogen gas produced is highly flammable so this reaction had to take place under the  hood until it reached completion. We then set up a filtration device, which used a vacuum to pull  the solution through a filter paper, and then added sulfuric acid to the flask and the potassium  aluminate reacted with the sulfuric acid to for a precipitate, aluminum hydroxide.  2KAlO 2
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  • Spring '06
  • Van Koppen
  • Sulfuric acid, potassium ions, alum crystals, net  ionic reaction, precipitate dissolved completely.

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