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The following information is to be used for the next two questions. Molar absorptivity data for...

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Chemistry

The following information is to be used for the next twoquestions. Molar absorptivity data for the cobalt and nickelcomplexes with 2,3-quinoxalinedithiol are εCo = 36400 and εNi =5520 at 510 nm and εCo = 1240 and ε Ni = 17500 at 656 nm. A 0.556-gsample was dissolved and diluted to 150.0 mL. A 25.0-mL aliquot wastreated to eliminate interferences; after addition of2,3-quinoxalinedithiol, the volume was adjusted to 50.0 mL. Thissolution had an absorbance of 0.866 at 510 nm and 0.218 at 656 nmin a 1.00-cm cell.

a.) Calculate the concentration of cobalt (in ppm) in theinitial solution prepared by dissolving the sample.

b.) Calculate the concentration of nickel (in ppm) in theinitial solution prepared by dissolving the sample.

Answer & Explanation Solved by verified expert
3.9 Ratings (540 Votes)
Here we have following two euations which have two unknown A 510 Co510bCo2 Ni 510bNi 2 A 656 Co656bCo2 Ni 656 bNi 2 Therefore A 510    See Answer
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