Lab report 4 - Gravimetric Determination of Sulfate...

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Gravimetric Determination of Sulfate; Semimicro Scale (Lab #4) Jesse LaSalle TA: Jimmy Martin Experiment completed: October 11 th , 2007 Lab report submitted: October 18 th , 2007
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I) Purpose : The purpose of the experiment was to ascertain the percent of sulfate in an unknown sample by using a gravimetric semimicro scale procedure. II) Procedure : Casey, J. and R. Tatz (2008). Measurements of Mass and Volume; Density. General Chemistry Laboratory Experiments , Hayden McNeil. Vol.1: 35-42. III) Data : (See attached report form.) IV) Calculations : 7) Mass of Sulfate in tube 1 = × Mass of sulfate mass of BaSO4 Molecular weight of SO4Molecular Weight of BaSO4 = . × . . SO4 0 07625 96 07233 4 = . × . SO4 0 07625 0 4116109683 = . SO4 0 03139g 8) Percent sulfate in sample of tube 1 % = × SO4 Mass of sulfateMass of original Sample 100 % = . . × SO4 0 031390 0460 100 % = . × = . % SO4 0 6823 100 68 23 10) Average Deviation = - + - Avg Deviation Percent tube 1 Avg percent Percent tube 2 Avg Percent2 = . - . + . - . Avg deviation 68 23 76 45 84 67 76 452 =- . + . Avg deviation 8 22 8 222 = . = . % Avg Deviation 16 442 8 22 V) Error analysis/Conclusion : There were many possible sources of error in this laboratory experiment.
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