Lab Report Exp16

Lab Report Exp16 - Ryan Cohen 4/20/09 Synthesis of Alum The...

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Ryan Cohen 4/20/09 Synthesis of Alum The purpose of this lab was to synthesize and analyze Alum, an inorganic salt, from normal Aluminum foil. Moreover, the lab performed a variety of tests to verify the chemical make-up of an Alum molecule. Finally, the lab demonstrated several techniques for crystallization of the produced Alum sample. The first part of the lab synthesized the inorganic Alum molecule from Aluminum foil. The aluminum foil was treated with strong acid, KOH, forming potassium aluminate. The resulting solution was treated with excess sulfuric acid, breaking apart the solution to Al 3+ , K + , SO 4 2- ions. Excess sulfuric acid was used because it neutralized the hydroxide in solution, allowing for simply ions and water to form. Finally, excess water was evaporated from the ion solution and the solution was cooled, saturating the ions and creating the Alum molecule, KAl(SO 4 ) 2 12H 2 O. The chemical equation for the synthesis of Alum went as follows: 2Al(s) + 2KOH(aq) + 22H
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This note was uploaded on 05/17/2011 for the course CHEM 1AL taught by Professor Hooker during the Spring '07 term at UCSB.

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Lab Report Exp16 - Ryan Cohen 4/20/09 Synthesis of Alum The...

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