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18 Nov 2019
Molar absorptivity data for the cobalt and nickel complexes with 2, 3-quinoxalinedithiol are epsilon C_0 = 36400 and epsilon N_i = 5520 at 510 nm and epsilon_Co = 1240 and epsilon N_i = 17500 at 656 nm. a 0.503 -g sample was dissolved and diluted 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 0.530 at 510 nm and 0.341 at 656 nm in a 1.00-cm cell. Calculate the concentration in parts per million of cobalt and nickel in the sample. Concentration of cobalt = ppm Concentration of nickel = ppm
Molar absorptivity data for the cobalt and nickel complexes with 2, 3-quinoxalinedithiol are epsilon C_0 = 36400 and epsilon N_i = 5520 at 510 nm and epsilon_Co = 1240 and epsilon N_i = 17500 at 656 nm. a 0.503 -g sample was dissolved and diluted 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 0.530 at 510 nm and 0.341 at 656 nm in a 1.00-cm cell. Calculate the concentration in parts per million of cobalt and nickel in the sample. Concentration of cobalt = ppm Concentration of nickel = ppm
Jean KeelingLv2
4 Nov 2019