3.4Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol areEco=36,400 and EN=5520 at 510 nm and Eco-1240 and EN=17,500 at 656 nm. A 0.425 gsample was dissolved and diluted to 50.0 mL. A 25.0 mL aliquot was treated to eliminateinterferences, after addition of 2,3-quinoxalinedithiol, the volume was adjusted to 50.0mL. This solution had an absorbance of 0.446 at 510 nm and 0.326 at 656 nm in a 1.00cm cell. Calculate the concentration (parts per million) of Co and Ni in the sample.

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lar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are =36,400 and EN=5520 at 510 nm and Eco-1240 and EN=17,500 at 656 nm. A 0.425 g mple was dissolved and diluted to 50.0 mL. A 25.0 mL aliquot was treated to eliminate erferences, after addition of 2,3-quinoxalined ithiol, the volume was adjusted to 50.0 . This solution had an absorbance of 0.446 at 510 nm and 0.326 at 656 nm in a 1.00 cell. Calculate the concentration (parts per million) of Co and Ni in the sample.

lar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are =36,400 and EN=5520 at 510 nm and Eco-1240 and EN=17,500 at 656 nm. A 0.425 g mple was dissolved and diluted to 50.0 mL. A 25.0 mL aliquot was treated to eliminate erferences, after addition of 2,3-quinoxalined ithiol, the volume was adjusted to 50.0 . This solution had an absorbance of 0.446 at 510 nm and 0.326 at 656 nm in a 1.00 cell. Calculate the concentration (parts per million) of Co and Ni in the sample.

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Chapter1: Chemical Foundations

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UV Visible Spectroscopy

Spectroscopy refers to the absorption or emission of light or other radiations by matter. When a substance or chemical absorbs light or radiation, they reach an excited state followed by de-excitation or emission of the light or radiation forming distinct spectra. UV-visible spectroscopy or ultraviolet-visible refers to the absorption and emission in the ultraviolet and visible regions of the electromagnetic spectrum.

Question

3.4
Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are
Eco=36,400 and EN=5520 at 510 nm and Eco-1240 and EN=17,500 at 656 nm. 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 had an absorbance of 0.446 at 510 nm and 0.326 at 656 nm in a 1.00
cm cell. Calculate the concentration (parts per million) of Co and Ni in the sample.

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