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Alum Synthesis Lab Report

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Alum Synthesis Lab Report
The experiment's objectives were to synthesize alum, test for various ions in alum, and form crystals in aqueous alum solution. The alum was synthesized from aluminum foil and run through a filtration system to isolate the alum.
2 Al(s) + 2 KOH + 22 H2O + 4 H2SO4 → 2 KAl(SO4)2●12H2O(s) + 3 H2(g)
Its composition was analyzed using two precipitation tests and two flame tests. Three methods for growing crystals were then set up for observation next lab.
Theoretical yield and percent yield: The theoretical yield for alum was 4.55g and the percent yield was 139%. The percent yield was above 100% because the alum was saturated with ethanol and water.
KOH test: The KOH test identified the presence of aluminum in alum. When KOH was added to an aqueous
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