1) A Chem 102 Student prepared a cobalt coordination compound. Parts "a-c" refer to this problem.a) Next, she analyzed the cobalt content of the compound by preparing a series of known concentration cobaltsolutions and prepared a Beer's law graph of absorbance (Y) versus concentration(X). The equation of the line wasdetermined using Excel to be: Y=7.50 Xthe coordination compound and ultimately diluted it to a total volume of 100.0 mL and measured its absorbanceto be 0.310. Calculate the percent cobalt (by mass) in the compound.Where X is concentration in Molarity. She weighed 1.1050 g of

A numerical problem based on quantitative analysis, which is to be accomplished.

Answered: 1) A Chem 102 Student prepared a cobalt…

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter24: Introduction To Spectrochemical Methods

Section: Chapter Questions

Problem 24.21QAP

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A solution containing 1.00 mg ion (as the thiocyanate complex) in 100 mL was observed to transmit 70 % of the incident light compared to an appropriate blank. (a) What is the absorbance of this solution at this wavelength? (b) What fraction of light would be transmitted by a solution of iron four times as concentrated?
In optical analysis, what are the methods used to calculate the concentration ofa solution from the absorbance measurements of colorimeters?
Atomic absorption spectroscopy with graphite furnace atomization is an extremely sensitive technique. The standard addition method is used with this technique to determine the concentration of copper in urine. A 20.00 mL sample of urine is spiked with 1.00 mL of 300. ppb Cu²+ and this mixture gives a response of 0.168. Another 1.00 mL aliquot of 300. ppb Cu²+ is added to this mixture and gives a reading of 0.235Determine the concentration of copper in the urine sample
. A solution containing the complex formed between two substances has a molar absorptivity of 9.32 X 103 L mol-1 cm-1 at 470 nm. a)What is the absorbance of a 6.24x10-5 M solution of the complex at 470 nm in a 1.00 cm cell? b)What is the percent transmittance of the solution described in (a)? c)What is the molar concentration of the complex in a solution that has the absorbance described in (a) when measured at 470 nm in a 5.00 cm cell . A solution containing the complex formed between two substances has a molar absorptivity of 9.32 X 103 L mol-1 cm-1 at 470 nm. a)What is the absorbance of a 6.24x10-5 M solution of the complex at 470 nm in a 1.00 cm cell? b)What is the percent transmittance of the solution described in (a)? c)What is the molar concentration of the complex in a solution that has the absorbance described in (a) when measured at 470 nm in a 5.00 cm cell
A solution containing 1.00mg iron (as the thiocyanate complex) in 100mL was observed to transmit 70.0% ofthe incident light compared to an appropriate blank. (a) What is the absorbance of the solution at thiswavelength? (b) What fraction of light would be transmitted by a solution of iron four times as concentrated?
The complex formed between Cu(I) and 1,10-phenanthroline has a molar absorptivity of 7000L mol-1 cm-1 at 435 nm, the wavelength of maximum absorption. Calculate a. the absorbance of an 8.50 x 10-5 M solution of the complex when measured in a 1.00-cm cell at 455b. the percent transmittance of the solution in part ac. the concentration of a solution that in a 5.00-cm cell has the same absorbance as the solution in part ad. the path length through a 3.40 x 10-5 M solution of the complex that is needed for an absorbance that is the same as the solution in part a
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.
The complex formed between Cu(I) and 1,10-phenanthroline has a molar absorptivity of 7000 L mol-1 cm-1 at 435 nm, the wavelength of maximum absorption. Calculate a.) the absorbance of an 8.50x10-5 M solution of the complex when measured in a 1.00-cm cell at 435 nm. b.) the percent transmittance of the solution in part (a) c.) the concentration of a solution that in a 5.00-cm cell has the same absorbance as the solution in part (a) d.) the path length through a 3.40x10-5 M solution of the complex that is needed for an absorbance that is the same as the solution in part (a)
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1. Pigments, which are usually highly coloured salts, are suspended in an organic carrier made up of a range of heavy hydrocarbon molecules in oil paints. a. The pigments applied in the oil painting may have come from the periodic table's d-block elements. Explain why the elements in the d-metal block's compounds can produce colour compounds. b. If a compound absorbs the colours green, blue, and violet, what colour would the coordinating compound be? c. According to the IUPAC definition, several elements in the d-block cannot be considered transition metals. Identify two of these elements and explain why they were excluded.
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 + 0.16082. Line equation: y = -2.5963x + 2.7203
If the absorbance of 0.244 M copper (II) chloride solution is 0.534 and the path length of light is 1.00 cm, what is the Beer's Law extinction coefficient, epsilon?

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