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Titration of Copper in Brass

# Titration of Copper in Brass - Stephanie Warner Chem 153...

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Stephanie Warner Chem 153 Shidong Chu 7 October 2005 Titration of Copper in Brass Purpose: The purpose of this lab is to determine the weight percent of copper in an unknown, through titration. Calculations: 1.1713 KIO 3 / 214.001 g/mol KIO 3 = 0.00547 mol KIO 3 0.00547 mol KIO 3 / 0.500 L = 0.0109 M KIO 3 in 500 mL flask (0.0109 mol KIO 3 / 1 L)(0.0500 L) = 5.45 x 10 -4 mol KIO 3 in 50 mL flask (5.45 x 10 -4 mol KIO 3) (6) = 0.00327 mol S 2 O 3 2- Standardization Trial 1: 0.00327 mol S 2 O 3 2- / 0.03651 L titrated = 0.0896 M S 2 O 3 2- Q Test for Standardization: 0.0896, 0.0895, 0.0953, 0.0945 (0.0953-0.0945)/ (0.0953-0.0895) = 0.14 (0.0895-0.0896)/ (0.0953-0.0895) = 0.02 No outliers Average: (0.0869 + 0.0895 + 0.0953 + 0.0954) / 4 = 0.0922 average M S 2 O 3 2- Unknown: Trial 1: (0.02433 L S 2 O 3 2- titrated)(0.0922 mol S 2 O 3 2- / 1 L) = 0.00224 mol S 2 O 3 2- (0.00224 mol S 2 O 3 2- )(1 mol Cu 2- / 1 mol S 2 O 3 2- ) = 0.00224 mol Cu 2- {[(0.00224 mol Cu 2- )(63.55 g/mol Cu 2- )] / 1.2035 g unknown }x 100 = 11.8% wt Cu unk Q Test for Unknown: 11.8, 11.9, 13.4, 11.8 (13.4-11.9)/(13.4-11.8) = .93 13.4% is an outlier Average:

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Titration of Copper in Brass - Stephanie Warner Chem 153...

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