Ortho-phenanthroline reacts with ferrous ion to produce a deeply colored complex with a molar absorptivity (s) of 11,100 L/mol1 cm-1 at a max of 508 nm. You diluted the stock colored complex that you were provided using a 4 fold serial dilution. You measured the third dilution in the series in a plastic cuvette with a pathlength of 0.5 cm at 508 nm and obtained an absorbance of 0.73482. What was the concentration of the original stock solution in mM?

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…

Unknown Analysis: Calculate the mass spec. of 88g per mole. (show calculations and formulas) Below is a picture of the IR scan.

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Chris wants to study an organometal complex that was synthesized as shown below. Cr3+ + 2salen) = Cr(salen),³ He first prepared the working standards by adding specific volumes of Cr3+ solution and added 5.00 ml of 0.500M salen and diluted the solutions to 32.0 ml. The absorbance of each standard was then measured at the Amax, 425 nm, using a UV-Vis spectrophotometer as shown in the table below. Table 1. Standardized solutions containing Cr(salen);". Concentration (M) Blank Absorbance 0.021 0.010 0.015 0.220 0.295 0.020 0.025 0.356 0.421 0.473 0.030 He then prepared an unknown solution by mixing 1.00-ml of 0.500 M Cr3+ with 2.00-ml of 0.500 M salen and diluting to 32.0 mL. The resulting mixture was found to have an absorbance of 0.285. A blank solution was run before analyzing the unknown and gave an absorbance of 0.015. A. Determine the best fit line (with r) of the calibration curve. B. Calculate the equilibrium concentration (mM) of Cr3+ in the sample. c. Calculate the equilibrium…

1. Question: Pd (1I), Au (III) methiomeprazine (C19 H24 N2S2) with the complex. A mixture of their complexesis being analyzed. Pd (II) complex at 480 nm, The measurement results for Au (III) with max peak at 635 nm are as follows. of the mixture What is the concentration?(b=1) Pd(II) Au(III) Mixture 480 nm 3,55x103 2,96x103 0,533 635 nm 5,641x0³ 1,45x10 0,590

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A series of standard calibration solutions were prepared in 100 mL volumetric flask by reacting standard solutions of phosphate with molybdenum(VI) and reducing the phosphomolybdic acid complex to produce the characteristic blue color. The concentration of stock solution was 100 mg/L. The absorbance, A were measured using colorimetric spectrometer as shown in the below table. A calibration curve was plotted against the concentration of phosphorous. Volume of Phosphorous from stock solution (mL) Concentration of Absorbance phosphorus (mg/L) 1 0.001 5 0.086 10 0.173 25 0.403 50 0.794 Unknown sample 0.201 1. Calculate the concentration of phosphorus prepared in the series of calibration curve. 2. Assuming a linear relationship between the variables, determine the linear least- squares equation and correlation coefficient.

A reaction was carried out with Fe3+ and SCN- to produce FeSCN2+. Two best-fit lines for Absorbance vs [FeSCN-] were obtained. The first line produced: y = 200x + 0.005, r2=0.951 and the second line produced: y= 10,000x + 0.005, r2 = 0.993. Determine the best-fit line of two, and then use the line equation to determine the equilibrium concentration of FeSCN2+ if the absorbance = 0.863.

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