The absorbance values observed during the determination of the complex stoichiometry with the Job method using the spectroscopic method were plotted and the following correct equations were obtained. What is the n value of the compound formed by Fe + 3 and SCN- ions? 1. Line equation: y = 2.6188x + 0.1608 2. Line equation: y = -2.5963x + 2.7203 a) 1 b) 3 c) 0.5 d) 2 e) 5

The absorbance values observed during the determination of the complex stoichiometry with the Job method using the spectroscopic method were plotted and the following correct equations were obtained. What is the n value of the compound formed by Fe + 3 and SCN- ions? 1. Line equation: y = 2.6188x + 0.1608 2. Line equation: y = -2.5963x + 2.7203 a) 1 b) 3 c) 0.5 d) 2 e) 5

Appl Of Ms Excel In Analytical Chemistry

2nd Edition

ISBN:9781285686691

Author:Crouch

Publisher:Crouch

Chapter11: Dynamic Electrochemistry

Section: Chapter Questions

Problem 8P

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A series of standard iron-phenanthroline [Fe(phen)3]2+ complex ion solutions were prepared. The absorbance of each solution was measured at a wavelength of 510 mm. A calibration curve of absorbance vs. concentration was then plotted to obtain a linear equation of y = 0.0018x+0.0749. The absorbance of an unknown [Felphenly solution was measured to be 0.326. Calculate the concentration of the complex ion. NOTE! Report your answer as a WHOLE #. Type your answer...
We have a mixture of 100 mL of Fe3+ solution (1.00 × 10–3 M) and 100 mL of A- ion solution (1.00 × 10–3 M). The mixture has a deep blue color, indicating the formation of a complex between Fe3+ and A-. From spectrophotometric analysis, we find that 30.0% of the Fe3+ is in the form of a complex, where there are two probable formulae: FeX2+ or FeX3. a. Balance the following equations and calculate the concentrations of the remaining species. b. After reaching equilibrium states, write the equilibrium expressions and the equilibrium constants for both cases in (a).
A transition metal ion, M, forms a coloured complex with a monodentate ligand L. Portions of a 0.05 mol dm-³ solution of M are mixed with portions of a solution containing 0.05 mol dm-³ of L so that the total volume of the resulting mixture is always 10 cm³. The colour intensity of the complex in each mixture is measured using a colorimeter. The graph of the results is 0 1 2 3 3 4 5 6 7 8 9 10 cm³ of M 10 9 8 7 6 5 4 3 2 1 0 - cm³ of L What is the formula of the complex? A ML B ML₂ C ML₂ с D D ML4 Colour intensity 7:2
At 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00x103 L mol-1 cm-1. Calculate letter D ONLY a.) the absorbance of 2.50x10-5 M solution of the complex at 580 nm in 1.00-cm cell. = 0.175 b.) the absorbance of a solution in which the concentration of the complex is twice that in part (a). c.) the transmittance of the solutions described in parts (a) and (b). d.) the absorbance of a solution that has half the transmittance of that described in part (a).
At 580 nm, the wavelength of its maximum absorption, the complex Fe(SCN)2+ has a molar absorptivity of 7.00x103 L mol-1 cm-1. Calculate a.) the absorbance of 2.50x10-5 M solution of the complex at 580 nm in 1.00-cm cell. b.) the absorbance of a solution in which the concentration of the complex is twice that in part (a). c.) the transmittance of the solutions described in parts (a) and (b). d.) the absorbance of a solution that has half the transmittance of that described in part (a).
The complex formed between copper (I) and 1,10-phenanthroline has an absorption maximum at 435 nm and has an absorbance of 0.216 and a molar absorptivity of 7000 L cm-1 mol-1 when measured in a cell of 0 , 50 cm at a concentration of 6.17x10-5 mol / L. Determine its absorbance by making a change in the length of the cell at 3.50 cm.
An absorbance versus concentration data for the thiocyanatoiron(III) complex at 510 nm and makes a Beer's law plot.Based on the plot, what [Fe(SCN)2+] would the student report for a solution that has an absorbance of 0.300 at 510 nm? Also select all below closely matches the procedures to be followed in this experiment and why they are being carried out. 1) A Beer's law plot will be used as a means to determine the equilibrium concentration of the thiocyanatoiron(III) complex. 2)A Beer's law plot will be used to confirm known values of the equilibrium constant for the formation of the thiocyanatoiron(III) complex. 3)To make the Beer's law calibration graph, the formation equilibrium for the thiocyanatoiron(III) complex will be flooded with a large excess of thiocyanate ion. 4)To make the Beer's law calibration graph, the formation equilibrium for the thiocyanatoiron(III) complex will be flooded with a large excess of iron(III) ion.
A solution containing 4000 ug Fe(III) per cubic decimeter is treated with sulfosalicylic acid to form a colored complex. Its absorbance at a given wavelength in a 0.5 cm cell is measured to be 0.68. Calculate the molar absorptivity of the complex.
UV-visible spectroscopy provides information about cobalt(III) complexes. A blue cobalt complex has molar absorbtivity of 125 Lmol-1cm-1. Is the complex octahedral or tetrahedral? Justify your answer and explain the colour of the complex.
A standard solution was put through appropriate dilu tions to give the concentrations of iron shown in the ac companying table. The iron(II)-1,10,phenanthroline complex was then formed in 25.0-ml aliquots of these solutions, following which each was diluted to 50.0 mL (see color plate 15). The absorbances in the table (1.00-cm cells) were recorded at 510 nm Fe(II) Concentration in Original Solution, ppm Aşie 4.00 0.160 0.390 10.0 16.0 0.630 24.0 0.950 32.0 1.260 40.0 1.580 (a) Plot a calibration curve from these data. (b) Use the method of least squares to find an equa tion relatin g absorbance and the concentration of iron(II). (c) Calculate the standard deviation of the slope and intercept.
The absorbance of iron is determined at 508 nm. From the information given in the laboratory handout, what do you think the visible absorption spectrum of the iron complex [Fe(phen)3]2+ looks like?
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