Concept explainers
Interpretation:
The solution containing
Concept introduction:
The absorbance of the solution is the ability of the solution to absorb the monochromatic light passing through it. The absorbance of the solution is defined as the ratio of the intensity of light incident on the solution to the intensity of light absorbed by the solution.
The relation between the initial and final concentration of the solution after dilution can be given by.
The relation between the absorbance, path length, molar absorptivity and the concentration of the complex solution is:
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Chapter 13 Solutions
Principles of Instrumental Analysis
- A green solution containing Ni+2 ions absorbs 580 nm light. Undiluted, a sample of this solution sampled in a 1.00 cm diameter cuvette has an absorbance of 0.9765 a.u.. If the molar absorptivity coefficient for Ni+2 is 6.3 x 104 M -1 cm -1 at 580 nm, how much of the original stock Ni+2 solution (in mL) needs to be added to water to create a total dilute solution volume of 10.00 mL that measures an absorbance of 0.146 a.u. at 580 nm? Report your answer to 3 significant figures. Do not include the "mL' unit label in your responsearrow_forwardA metal complex with a Molecular mass of 820 g mol−1 was dissolved and the solution made up to 25 mL in a volumetric flask. 1 mL was withdrawn, placed in a 100 mL volumetric flask and diluted to the mark. The absorbance (at 457 nm) of this solution (in a 1 cm cuvette) was 0.245. The extinction coefficient for this compound at 457 nm (ε530) = 11715 M-1cm-1.(a) calculate the concentration of the compound in the cuvette.(b) calculate the concentration of the compound in the 25mL volumetric flask(c) determine the mass of compound used to make the 25mL solutionarrow_forwardThe absorbance of a 1.05x10-5 M Fe+3 determined at 580 nm using a 2.50-cm cell was said to be 0.200. What is the molar absorptivity of this solution in liters/mole cm?arrow_forward
- Pd(II) and Au(II) can be determined simultaneously by the reaction with methiomeprazine (C 19 H 24 N 2 S 2 ). The maximum absorption for Pd occurs at 480 nm, while for the Au complex it is at 635 nm. A sample of 25 mL was treated with excess of the complexant and then diluted to 50.0 mL. Calculate the molar concentrations of Pd(II) and Au(II) in the sample. The data are found in the table below and the bucket used was 1.0 cm.arrow_forwardAn aqueous solution of a Ni2+ complex with a concentration of 8.61 × 10–5 M was analyzed by a UV-VIS spectrometer at 470 nm and in a 1.00-cm cell; a percent transmittance value of 78.70% was recorded. What is the absorbance of the solution? * Provide your answer with three decimal places and without units. Avoid using scientific notation.arrow_forwardMercury(II) forms a 1:1 complex with triphenyltetrazolium chloride that exhibits an absorption maximum at 255 nm. The mercury(II) in a soil sample was extracted into an organic solvent containing an excess of TTC , and the resulting solution was diluted to 100.0 mL in a volumetric flask. Five-milliliter aliquots of the analyte solution were then transferred to six 25-mL volumetric flasks. A standard solution was then prepared that was 5*10^-6 M in . Volumes of the standard solution shown in the table were then pipetted into the volumetric flasks, and each solution was then diluted to 25.00 mL. The absorbance of each solution was measured at 255 nm in 1.00-cm quartz cells. Please solve and explain these questions: A.) Enter the given data pictured above into a spreadsheet and show the correct standard additions plot B.) Determine the slope and the intercept of the line C.)Determine the standard deviation of the slope and the intercept. D.) Calculate the concentration of Hg(II) in the…arrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning