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13. A 9.50 μM standard solution of X yields an absorbance of 0.657 at 630 nm using a 1.00-cm cuvette. The molar absorptivity for X at 630 nm is a) 40,700 M-¹cm¹ b) 614,000 M-¹cm-1 c) 1010 M-¹cm¹ d) 69,200 M¹¹cm-¹ e) 138,700 M-¹cm¹

13. A 9.50 μM standard solution of X yields an absorbance of 0.657 at 630 nm using a 1.00-cm cuvette. The molar absorptivity for X at 630 nm is a) 40,700 M-¹cm¹ b) 614,000 M-¹cm-1 c) 1010 M-¹cm¹ d) 69,200 M¹¹cm-¹ e) 138,700 M-¹cm¹

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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13. A 9.50 μM standard solution of X yields an absorbance of 0.657 at 630 nm using a 1.00-cm cuvette. The molar absorptivity for X at 630 nm is a) 40,700 M-¹cm-1 b) 614,000 M-¹cm-¹ c) 1010 M-¹cm-1 d) 69,200 M¹¹cm ¹ e) 138,700 M¹¹cm¹ 14. The molar absorptivity for ferricyanide ion (FW = 211.95 g/mol) at 420 nm is 1010 M-¹cm¹. What is the concentration of ferricyanide in a solution that yields an absorbance of 0.354 in a 1.00-cm cuvette? a) 30 ppm b) 45 ppm c) 60 ppm d) 75 ppm e) 90 ppm 15. Deviations from Beer's law are observed when measurements are made a) with highly concentrated solutions b) using polychromatic light sources c) in the presence of stray light d) all of these e) none of these 16. Photometric assays typically involve measuring absorbance at an analyte's "Amax" in order to a) maximize sensitivity b) maximize selectivity c) maximize accuracy d) maximize precision e) maximize detection limit 17. The calibration curves shown at the right indicate the photometric measurements satisfy Beer's law at both 550 nm and 635 nm. Which statement below is true? a) analysis at 550 nm yields a more sensitive analysis b) analysis at 635 nm yields a more sensitive analysis c) analysis at 550 nm yields a more sel analysis d) analysis at 635 nm yields a more selective analysis e) these curves do NOT satisfy Beer's law 18. A sample solution yielded an absorbance of 0.723 at 550 nm when analyzed using the procedure that produced the calibration curves at the right. The concentration of analyte in the sample solution is a) 15 µg/mL b) 17 µg/mL c) 20 µg/mL d) 23 µg/mL e) 27 µg/mL Absorbance 1.2 1 0.8 0.6 0.4 0.2 о 10 20 550 nm y=0.0405x+0.0191 R² = 0.9989 Concentration (µg/mL) 635 nm y= 0.0266x+0.0065 R² = 0.999 30 40
Transcribed Image Text:13. A 9.50 μM standard solution of X yields an absorbance of 0.657 at 630 nm using a 1.00-cm cuvette. The molar absorptivity for X at 630 nm is a) 40,700 M-¹cm-1 b) 614,000 M-¹cm-¹ c) 1010 M-¹cm-1 d) 69,200 M¹¹cm ¹ e) 138,700 M¹¹cm¹ 14. The molar absorptivity for ferricyanide ion (FW = 211.95 g/mol) at 420 nm is 1010 M-¹cm¹. What is the concentration of ferricyanide in a solution that yields an absorbance of 0.354 in a 1.00-cm cuvette? a) 30 ppm b) 45 ppm c) 60 ppm d) 75 ppm e) 90 ppm 15. Deviations from Beer's law are observed when measurements are made a) with highly concentrated solutions b) using polychromatic light sources c) in the presence of stray light d) all of these e) none of these 16. Photometric assays typically involve measuring absorbance at an analyte's "Amax" in order to a) maximize sensitivity b) maximize selectivity c) maximize accuracy d) maximize precision e) maximize detection limit 17. The calibration curves shown at the right indicate the photometric measurements satisfy Beer's law at both 550 nm and 635 nm. Which statement below is true? a) analysis at 550 nm yields a more sensitive analysis b) analysis at 635 nm yields a more sensitive analysis c) analysis at 550 nm yields a more sel analysis d) analysis at 635 nm yields a more selective analysis e) these curves do NOT satisfy Beer's law 18. A sample solution yielded an absorbance of 0.723 at 550 nm when analyzed using the procedure that produced the calibration curves at the right. The concentration of analyte in the sample solution is a) 15 µg/mL b) 17 µg/mL c) 20 µg/mL d) 23 µg/mL e) 27 µg/mL Absorbance 1.2 1 0.8 0.6 0.4 0.2 о 10 20 550 nm y=0.0405x+0.0191 R² = 0.9989 Concentration (µg/mL) 635 nm y= 0.0266x+0.0065 R² = 0.999 30 40
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