P23-27: Molar absorptivity data for the cobalt and nickel complexes with 2,3- quinoxalinedithiol are ÎµCo = 36,400...

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P23-27: Molar absorptivity data for the cobalt andnickel complexes with 2,3-
quinoxalinedithiol are ÎµCo = 36,400 and ÎµNi = 5520 at 510 nm andÎµCo = 1240 and ÎµNi = 17,500 at 656 nm. A 0.425-g sample wasdissolved and diluted to 50.0 mL. A 25.0-mL aliquot was treated toeliminate interferences; after addition of 2,3quinoxalinedithiol,the volume was adjusted to 50.0 mL. This solution had an absorbanceof 0.446 at 510 nm and 0.326 at 656 nm in a 1.00-cm cell. Calculatethe parts per million of cobalt and nickel in the sample.

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3.7 Ratings (667 Votes)

At 510 nm Co absorbs strongly According to Beers law Absorption A cl or 0446 36400 M1cm1 c 1 cm or concentration c 123105 M So the concentration of Co in the final 50 mL solution 123105 M Amount of Co in the final 50 mL See Answer

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