c. Use the Table to answer the questions below Concentration (M) Absorbances 0.20 0.36 0.40 0.50 0.60 0.65 0.80 0.75 Plot the graph and attach your plot. Use the table to answer the following question i. If 1.1 cm cell was used. Calculate the molar absorptivity of Cr(III). ii. What is the concentration of a compound with absorbance 0.60, if 2 cm cell is used.

c. Use the Table to answer the questions below Concentration (M) Absorbances 0.20 0.36 0.40 0.50 0.60 0.65 0.80 0.75 Plot the graph and attach your plot. Use the table to answer the following question i. If 1.1 cm cell was used. Calculate the molar absorptivity of Cr(III). ii. What is the concentration of a compound with absorbance 0.60, if 2 cm cell is used.

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter12: Spectrochemical Methods

Section: Chapter Questions

Problem 2P

See similar textbooks

Similar questions

A solution of altura red of concentration 307 ppm gives an absorbance of 0.616. What concentration is a solution of allura red which gives an absorbance reading of 0.261? The same cell (cuvette) with a path length of 1.000 cm is used for both readings. Report your answer to the nearest whole number without units? Hint: A=abc, where c can have any concentration units. dont provide handwriten solution
Questions 11 and 12 refer to the same set of absorbance readings that were taken on metal-EDTA complexes in a different solution known to contain cobalt and nickel. The cuvette width is 1.00 cm. Given the following, what is the concentration of Co2+ in solution? (Four decimal places) Given the following, what is the concentration of Ni2+ in solution? (Four decimal places)
(b) Although the outermost electronic configuration of transition elements is ns1or ns2likealkali and alkaline earth metal still they are not reactive like group 1&2 elements whyit is so?(c) What is molar conductance, equivalent conductance and specific conductance? Howthey are interrelated? Discuss on each type of conductance effect of dilution with graph.
b. Given that the cuvette path length was 1.17 cm, use the slope of this line to calculate the molar absorptivity of the cobalt complex at this wavelength. (Assume Beer’s law is obeyed.) c. An unknown cobalt sample was treated as follows: 40.8 mg of the unknown was dissolved in solvent to prepare 50.00 mL of solution in a volumetric flask. 4.00 mL of this solution was treated with thiocyanate, and diluted to a final volume of 50.00 mL. A sample of this final solution was placed in the same cuvette as the standards, and showed an absorbance of 0.38 at 625 nm. Determine the percentage of cobalt in the original unknown, given that the atomic mass of cobalt is 58.933 g/mol.
Calculate for the molar absorptivity coefficient of a 0.55 microgram per liter Cr(III) chelate solution that exhibits an absorbance of 0.9765 at 590 nm measured in a 1.00 cm cell.
Describe the principle and operation of anodic stripping voltammetry (ASV). How does it differ from adsorptive stripping voltammetry? What is the quantitative signal?
A copper(II) sulfate solution of unknown concentration is placed in a colorimeter and an absorbance reading of 0.46 is recorded. Using the same solution cell, a 0.055 Μ solution of copper(II) sulfate gives an absorbance reading of 0.34. What is the concentration of the first solution?
Which are true for polarography? I Polarography is amperometry conducted with a dropping Hg electrode. II The diffusion current in the plateau region of the polarographic wave is proportional to the concentration of the analyte and is used for quantitative analysis. III The half-wave potential for maximum current is characteristic of a given analyte in a given medium and can be used for qualitative analysis for the analyte. IV Fresh Hg drops give reproducible results. V Polarography is used to primarily to study oxidations Hg may reduce when studying reductions. A.I, III, and IV B. II, III, and V C. I and V D. III, IV, and V E. II, III, and IV
4.In a certain conductivity cell, the resistance of a 0.01 M KCl solution is 150 Ω. Theknown molar conductivity of the solution is 141.27 Ω-1 cm2 mol-1. Calculate the cell constant (Kcell).*(Kcell unit is cm-1) 5. Using the same conductance cell as in Question No. 4, a student measured the resistanceof a 0.10 M NaCl solution to be 19.9Ω. Calculate the experimental value of the molarconductivity of this solution.
The accompanying data (1.00-cm cells) were obtained for the spectrophotometric titration 10.00 mL of Pd(II) with 2.44 10-4 M Nitroso R(O. W Rollins and M. M. Oldham, Anal. chem .,1971, 43, 262, DOI: 10.1021/ac60297a026). Calculate the concentration of the Pd(II) solution, given that the ligand-to-cation ratio in the colored product is 2:1
Using the graph below, what is the concentration of a solution with an absorption of 0.369 when measured at 460 nm in a 1.0 cm cuvette. Remember units! Show your work for this problem on the last page of the form.