Experiment #04 Identification of Alum

# Experiment #04 Identification of Alum - 0.05206 mol Ratio...

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Experiment 4 Part 1: Finding the Melting Point of Alum Constants: Experimental MP of Alum 92.1 MW of Anhydrous Alum 258.2 g/mol Theoretical MP of Alum 95.0 MW of Water 18.0 g/mol Percent Error 3.05 % 233.4 g/mol 96.06 g/mol MW of Alum (hydrated) 474.2 g/mol 0.2 M Part 2: Determine the Amount of Water of Hydration in Alum Crystals Mass Crucible + Cover 15.371 Mass Crucible,Cover, + Alum 17.415 Mass of Alum Used 2.044 g Mass Crucible,Cover, + Alum after heating 16.478 g Mass of Alum after heating 1.107 g Mass of Water Driven Off 0.937 g Moles of Anhydrous Alum 0.00429 mol Moles of Water Driven Off
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Unformatted text preview: 0.05206 mol Ratio of Water to Alum moles 0.05206 0.00429 Ratio of Water to Alum (Adjusted) 12.1 1 Experimental Error 1.18 % Part 3: Determine the Percent Sulfate in Alum Mass of Alum Used 1.062 g 44.79 ml 45 ml Mass of Gooch Crucible 31.548 g 32.586 g 1.038 g Percentage of Sulfate in Alum 40.23 % % Error (actual = 40.53%) 0.75 % Identification of Alum, KAl(S0 4 ) 2 . 12H 2 o C o C MW of BaSO 4 MW of SO 4 = [Ba(NO 3 ) 2 ] used Volume of Ba(NO 3 ) 2 Needed Volume of Ba(NO 3 ) 2 Used Mass of Crucible + BaSO 4 Mass of BaSO 4...
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