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What is the mass of Cu in the unknown sample solution? 2. What is the most probable identity of the unknown copper compound, assuming there is 1 mole of Cu per mole of the unknown? 3. In the preparation of Standard 1, how much of the prepared stock Cu(II) solution should be diluted to come up with the desired concentration?

What is the mass of Cu in the unknown sample solution? 2. What is the most probable identity of the unknown copper compound, assuming there is 1 mole of Cu per mole of the unknown? 3. In the preparation of Standard 1, how much of the prepared stock Cu(II) solution should be diluted to come up with the desired concentration?

Chemistry
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
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1. What is the mass of Cu in the unknown sample solution? 2. What is the most probable identity of the unknown copper compound, assuming there is 1 mole of Cu per mole of the unknown? 3. In the preparation of Standard 1, how much of the prepared stock Cu(II) solution should be diluted to come up with the desired concentration?
A UV-Vis spectrophotometry experiment for the determination of an unknown copper compounds was carried out by first preparing 250.0 mL of a 100.0 mg/L Cu(II) stock solution using a 100% pure copper(II) chloride dihydrate, CuCl₂-2H₂0. Appropriate volumes of this stock solution were then pipetted, added with concentrated ammonia, and diluted in volumetric flasks to come up with 50.00-mL standard solutions with concentrations of 0, 2.50, 5.00, 10.00, 25.00, and 50.00 mg/L. For the copper sample, a 50.00-mL solution was prepared by dissolving 3.25 mg of the unknown compound. The absorbance of the blank, standards, and the unknown sample were then measured at the analytical wavelength of 610 nm. The relevant data are shown below. Solution Concentration (mg/L) Volume (mL) Absorbance Blank 0 50.00 0.028 Standard 1 2.50 50.00 0.121 Standard 2 5.00 50.00 0.222 Standard 3 10.00 50.00 0.442 Standard 4 25.00 50.00 0.902 Standard 5 50.00 50.00 1.920 Sample ? 50.00 0.989
Transcribed Image Text:A UV-Vis spectrophotometry experiment for the determination of an unknown copper compounds was carried out by first preparing 250.0 mL of a 100.0 mg/L Cu(II) stock solution using a 100% pure copper(II) chloride dihydrate, CuCl₂-2H₂0. Appropriate volumes of this stock solution were then pipetted, added with concentrated ammonia, and diluted in volumetric flasks to come up with 50.00-mL standard solutions with concentrations of 0, 2.50, 5.00, 10.00, 25.00, and 50.00 mg/L. For the copper sample, a 50.00-mL solution was prepared by dissolving 3.25 mg of the unknown compound. The absorbance of the blank, standards, and the unknown sample were then measured at the analytical wavelength of 610 nm. The relevant data are shown below. Solution Concentration (mg/L) Volume (mL) Absorbance Blank 0 50.00 0.028 Standard 1 2.50 50.00 0.121 Standard 2 5.00 50.00 0.222 Standard 3 10.00 50.00 0.442 Standard 4 25.00 50.00 0.902 Standard 5 50.00 50.00 1.920 Sample ? 50.00 0.989
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