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11.Cobalt and nickel can be determined simultaneously by complexing the two ions with 2,3-quinoxalinedithiol. The absorption maximum for the cobalt complex occurs at 510 nm, and that for the nickel complex is at 656 nm. Molar absorptivity data at these wavelengths are shown in the following table: 510 nm 656 nm Co complex 36400 1240 Ni complex 5520 17500 A 0.425 g sample was dissolved and diluted to 50.0 mL. A 25.0 ml aliquot was treated to eliminate interferences, after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This solution has an absorbance of 0.446 at 510 nm and 0.326 at 656 nm in a 1.00-cm cell. Calculate the concentration in parts per million of cobalt and nickel in the original sample.

11.Cobalt and nickel can be determined simultaneously by complexing the two ions with 2,3-quinoxalinedithiol. The absorption maximum for the cobalt complex occurs at 510 nm, and that for the nickel complex is at 656 nm. Molar absorptivity data at these wavelengths are shown in the following table: 510 nm 656 nm Co complex 36400 1240 Ni complex 5520 17500 A 0.425 g sample was dissolved and diluted to 50.0 mL. A 25.0 ml aliquot was treated to eliminate interferences, after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This solution has an absorbance of 0.446 at 510 nm and 0.326 at 656 nm in a 1.00-cm cell. Calculate the concentration in parts per million of cobalt and nickel in the original sample.

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
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11.Cobalt and nickel can be determined simultaneously by complexing the two ions with 2,3-quinoxalinedithiol. The absorption maximum for the cobalt complex occurs at 510 nm, and that for the nickel complex is at 656 nm. Molar absorptivity data at these wavelengths are shown in the following table: 510 nm 656 nm Co complex 36400 1240 Ni complex 5520 17500 A 0.425 g sample was dissolved and diluted to 50.0 mL. A 25.0 ml aliquot was treated to eliminate interferences, after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This solution has an absorbance of 0.446 at 510 nm and 0.326 at 656 nm in a 1.00-cm cell. Calculate the concentration in parts per million of cobalt and nickel in the original sample.
Transcribed Image Text:11.Cobalt and nickel can be determined simultaneously by complexing the two ions with 2,3-quinoxalinedithiol. The absorption maximum for the cobalt complex occurs at 510 nm, and that for the nickel complex is at 656 nm. Molar absorptivity data at these wavelengths are shown in the following table: 510 nm 656 nm Co complex 36400 1240 Ni complex 5520 17500 A 0.425 g sample was dissolved and diluted to 50.0 mL. A 25.0 ml aliquot was treated to eliminate interferences, after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. This solution has an absorbance of 0.446 at 510 nm and 0.326 at 656 nm in a 1.00-cm cell. Calculate the concentration in parts per million of cobalt and nickel in the original sample.
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