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Experiment 5

# Experiment 5 - Experiment 5 Gravimetric Determination of...

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Experiment 5: Gravimetric Determination of Sulfate; Semimicro Scale Kim Smith Chemistry 121 11/5/10 T.A.-Taylor Conway

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Purpose: The purpose of this experiment is to determine the percent sulfate in a sample. Procedure: Refer to pages 41-42 of Laboratory Experiments in General chemistry, Volume 1 by Judith Casey and Robert Tatz, Hayden McNeil Publishing, 2009-2010. Report Sheet: See attached report sheet Sample Calculations: Sample Calculation 7: gBaSO 4 x 96.06 SO 4 2- / 233.39 BaSO 4 = g SO 4 2- 0.22620g x 96.06g / 233.39 = 0.0931 g SO 4 2- tube 1 kim 0.22120g x 96.06g / 233.39 = 0.0910 g SO 4 2- tube 2 kim Sample Calculation 8: g SO 4 2- / g sample x 100% = % SO 4 2- 0.0931g / 0.0582g x 100 % = 160.0 % tube 1 kim 0.0910g / 0.0628g x 100% = 144.9 % tube 2 kim Sample Calculation 10: Average =160.0-144.9 / 2 = 152.5% 160.0 -152.5 = 7.5 144.0 -152.5 = -7.6 Average Deviation = 7.5 + 7.6 / 2 = 7.5 Average Deviation / average x 100% = 7.5 / 152.5 x 100% = 4.95 % Questions: 1. Explain how your calculated value for percent sulfate would be affected (i.e., would it be higher or lower than the value if the procedure was done correctly) if:
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Experiment 5 - Experiment 5 Gravimetric Determination of...

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