A Ni⁺² solution (2 x 10^-4 M) complexed with 8-hydroxy quinolinol yielded 22.3%T when measured at 365 nm in a 1.00 cm cell. A 0.100g unknown sample, analyzed by the same method, was dissolved and diluted to 250 mL. A 50.0 mL aliquot of this solution was complexed with 8-hydroxyquininol and diluted to 100.0 mL, yielding a transmittance of 12.7%. What is the % Ni in the unknown sample?

The correct answer is 8.1% but I don't know how to get to that.

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Jean KeelingLv2

17 Dec 2019

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The following information is to be used for the next two questions. Molar absorptivity data for the cobalt and nickel complexes with 2,3-quinoxalinedithiol are Îµ_Co = 36400 and Îµ_Ni = 5520 at 510 nm and Îµ_Co = 1240 and Îµ _Ni = 17500 at 656 nm. A 0.475-g sample was dissolved and diluted to 100.0 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 0.963 at 510 nm and 0.292 at 656 nm in a 1.00-cm cell.

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

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