Preparation of Alum report - Preparation of Alum, Aluminum...

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Preparation of Alum,Aluminum Potassium SulfateDodecahydrate, from AluminumHoa ChungChemistry 1A Spring 2016 February 18, 2016Objective/PurposeCalculate the theoretical yield and percent yield of a synthesis reaction.TheoreticalThe equations given below show the complete sequence of reactions involved in our experiment.1.Reaction of aluminum with KOH (the dissolution step)2Al(s) + 2 KOH(aq) + 6 H2O(l) →2 KAl(OH)4(aq) + 3 H2(g)2.Initial addition of sulfuric acid (precipitation of Al(OH)3)2KAl(OH)4(aq) + H2SO4(aq) →2 Al(OH)3(s) + K2SO4(aq) + 2 H2O(l)3.Further addition of sulfuric acid (dissolving of Al(OH)3)2Al(OH)3(s) + H2SO4(aq) → Al2(SO4)3(aq) + 6 H2O(l)4.Precipitation of alum on coolingK2SO4(aq) + Al2(SO4)3(aq) + 12 H2O(l) →2 KAl(SO4)212 H2O(s)% yield =actual yieldtheoretical yieldx100Pre-lab Sections:Data:
Table 1: Preparation of AlumMass of weighing paper (g)0.3550Mass of weighing paper + Al foil (g)1.3551Mass of Al foil (g)1.0001Mass of empty 50 mL beaker (g)
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Aluminium, sulfate, Alum

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