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Brass is an alloy consisting mainly of copper and zinc. To determine the percentage of copper in a sample of brass, 2.63 g of the brass was dissolved in concentrated nitric acid and the solution diluted to 250 mL in a standard flask. Excess potassium iodide was added to 25.0 ml of this solution, iodine being produced according to the equation: 2Cu*"(aq) + 41(aq) → 2Cul(s) + 1(aq) The iodine formed was titrated with 0.1000 M sodium thiosulfate solution, Na,s,0,(aq), the volume required for complete reaction being 24.8 mL. 1,(aq) + 25,0,*(aq) → 21(aq) + 5,0,(aq) colorless colorless

Brass is an alloy consisting mainly of copper and zinc. To determine the percentage of copper in a sample of brass, 2.63 g of the brass was dissolved in concentrated nitric acid and the solution diluted to 250 mL in a standard flask. Excess potassium iodide was added to 25.0 ml of this solution, iodine being produced according to the equation: 2Cu*"(aq) + 41(aq) → 2Cul(s) + 1(aq) The iodine formed was titrated with 0.1000 M sodium thiosulfate solution, Na,s,0,(aq), the volume required for complete reaction being 24.8 mL. 1,(aq) + 25,0,*(aq) → 21(aq) + 5,0,(aq) colorless colorless

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Chemistry
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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
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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 Calculate the percentage by mass of copper in the sample of brass.

7. Brass is an alloy consisting mainly of copper and zinc. To determine the percentage of copper in a sample of brass, 2.63 g of the brass was dissolved in concentrated nitric acid and the solution diluted to 250 ml in a standard flask. Excess potassium iodide was added to 25.0 ml of this solution, iodine being produced according to the equation: 2Cu* (aq) + 41(aq) → 2Cul(s) + L(aq) The iodine formed was titrated with 0.1000 M sodium thiosulfate solution, Na,S,0,(aq), the volume required for complete reaction being 24.8 mL. 1(aq) + 25,0,-(aq) → 21(aq) s,0,-(aq) + colorless colorless
Transcribed Image Text:7. Brass is an alloy consisting mainly of copper and zinc. To determine the percentage of copper in a sample of brass, 2.63 g of the brass was dissolved in concentrated nitric acid and the solution diluted to 250 ml in a standard flask. Excess potassium iodide was added to 25.0 ml of this solution, iodine being produced according to the equation: 2Cu* (aq) + 41(aq) → 2Cul(s) + L(aq) The iodine formed was titrated with 0.1000 M sodium thiosulfate solution, Na,S,0,(aq), the volume required for complete reaction being 24.8 mL. 1(aq) + 25,0,-(aq) → 21(aq) s,0,-(aq) + colorless colorless
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