12. A 0.3284-g sample of brass (containing lead, zinc, copper, and tin) was dissolved in nitric acid. The essentially insoluble SnO2•4H2O was removed by filtration, and the combined filtrate and washings were then diluted to 500.0 mL. A 10.00-mL aliquot was suitably buffered; titration of the lead, zinc, and copper in this aliquot required 37.56 mL of 0.002500 M EDTA. The copper in a 25.00 mL aliquot was masked with thiosulfate; the lead and zinc were then titrated with 27.67 mL of the EDTA solution. Cyanide ion was used to mask the copper and zine in a 100.0 mL aliquot; 10.80 mL of the EDTA solution was needed to titrate the lead ion. Determine the percent composition of the of the brass sample; evaluate the percent tin by difference.

12. A 0.3284-g sample of brass (containing lead, zinc, copper, and tin) was dissolved in nitric acid. The essentially insoluble SnO2•4H2O was removed by filtration, and the combined filtrate and washings were then diluted to 500.0 mL. A 10.00-mL aliquot was suitably buffered; titration of the lead, zinc, and copper in this aliquot required 37.56 mL of 0.002500 M EDTA. The copper in a 25.00 mL aliquot was masked with thiosulfate; the lead and zinc were then titrated with 27.67 mL of the EDTA solution. Cyanide ion was used to mask the copper and zine in a 100.0 mL aliquot; 10.80 mL of the EDTA solution was needed to titrate the lead ion. Determine the percent composition of the of the brass sample; evaluate the percent tin by difference.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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