Iron (II) ions catalyze the oxidation of luminal. The intensity of the resulting chemiluminescence has been shown to increase linearly with iron(II) concentration from 10-10 to 10-8 M. Exactly 1.00 ml of water was added to a 2.00 ml aliquot of an unknown Fe(II) solution, followed by 2.00 ml of a dilute H2O2 solution and 1.00 ml of an alkaline solution of luminol. The chemiluminescent signal from the mixture was integrated over a 10.0 s period and found to be 16.1. To a second 2.00 ml aliquot of the sample was added 1.00 ml of a 5.15 x 10-5 M Fe(II) solution followed by the same volume of H2O2 and luminol. The integrated intensity was 29.6. Calculate the Fe(II) molarity of the sample.

Iron (II) ions catalyze the oxidation of luminal. The intensity of the resulting chemiluminescence has been shown to increase linearly with iron(II) concentration from 10-10 to 10-8 M. Exactly 1.00 ml of water was added to a 2.00 ml aliquot of an unknown Fe(II) solution, followed by 2.00 ml of a dilute H2O2 solution and 1.00 ml of an alkaline solution of luminol. The chemiluminescent signal from the mixture was integrated over a 10.0 s period and found to be 16.1. To a second 2.00 ml aliquot of the sample was added 1.00 ml of a 5.15 x 10-5 M Fe(II) solution followed by the same volume of H2O2 and luminol. The integrated intensity was 29.6. Calculate the Fe(II) molarity of the sample.

Principles of Instrumental Analysis

7th Edition

ISBN:9781305577213

Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Publisher:Douglas A. Skoog, F. James Holler, Stanley R. Crouch

Chapter9: Atomic Absorption And Atomic Fluorescence Spectrometry

Section: Chapter Questions

Problem 9.1QAP

See similar textbooks

Similar questions

What is the activation energy (Qv) in eV/atom for a vancay formation if 10 moles of a metal has 2.3x10 ^ 13 vacancies at 425 C?
Mercury(II) forms a 1:1 complex with triphenyltetrazolium chloride that exhibits an absorption maximum at 255 nm. The mercury(II) in a soil sample was extracted into an organic solvent containing an excess of TTC , and the resulting solution was diluted to 100.0 mL in a volumetric flask. Five-milliliter aliquots of the analyte solution were then transferred to six 25-mL volumetric flasks. A standard solution was then prepared that was 5*10^-6 M in . Volumes of the standard solution shown in the table were then pipetted into the volumetric flasks, and each solution was then diluted to 25.00 mL. The absorbance of each solution was measured at 255 nm in 1.00-cm quartz cells. Please solve and explain these questions: A.) Enter the given data pictured above into a spreadsheet and show the correct standard additions plot B.) Determine the slope and the intercept of the line C.)Determine the standard deviation of the slope and the intercept. D.) Calculate the concentration of Hg(II) in the…
Which one of the following GC detectors are used for the quantification of drugs or metabolites in biological fluids? I. Microwave-induced plasma atomic emission II. Radiochemical detector III. Fourier transform (FT) infrared (IR) detector a. I and II b. II and III c. Only II Only II d. I and III e. I, II and III What do we obtain upon CID? I. Fragmentation of the precursor ions II. Fragmentation of the parent ion III. Fragmentation of product ions a. I and II b. I and III c. Only I d. I, II and III e. II and III
A student conducted an experiment to determine the concentration of benzene in an ethanol solution. Use the UV spectrum of the solution in a 2.0 cm cell. Within the spectrum, there was a peak attributed to benzene at 260 nm, with an absorption of 0.69. In a reference source, the student found that the adsorption of the benzene strip with ethanol was 2.95 x 10-3 ppm cm-. What is the molar concentration of benzene in the sample (mm of benzene = 78.11 g/mol)
Pd(II) and Au(II) can be determined simultaneously by the reaction with methiomeprazine (C 19 H 24 N 2 S 2 ). The maximum absorption for Pd occurs at 480 nm, while for the Au complex it is at 635 nm. A sample of 25 mL was treated with excess of the complexant and then diluted to 50.0 mL. Calculate the molar concentrations of Pd(II) and Au(II) in the sample. The data are found in the table below and the bucket used was 1.0 cm.
Radiation of wavelength 300 nm was passed through a chemical actinometer containing 10 ml of a 0.05M oxalic acid solution and 0.01M uranyl sulphate. The concentration of oxalic acid solution became 0.03M after absorption of 80J radiation energy. Calculate the quantum yield of the photodecomposition of the oxalic acid?
4) A substance is known to have a molar extinction coefficient of 18,300 mL*cm6-1*mg^-1 at its wavelength of maximum absorption. The absorption of a solution containing this substance in a 1-cm sample cell was found to be 0.327 at this same wavelength. Determine the concentration of the solution.
What is the mechanism involved upon observation of the blue-black color in Iodometry? complexation between the ferric ions and analyte adsorption of molecular iodine in the helical structure of amylose formation of starch-iodo complex back-titration has been performed
Exactly 10.00-mL aliquots of a solution containing phenobarbital were measured into 50.00-mL volumetric flasks and made basic with KOH. The following volumes of a standard solution of phenobarbital containing 2.000μg/mL of phenobarbital were then introduced into each flask and the mixture was diluted to volume: 0.000, 0.500, 1.00, 1.50, 2.00 mL. The fluorescence of each of these solutions was measured with a fluorimeter, which gave values of 3.26, 4.80, 6.41, 8.02, 9.56, respectively. a. plot the data. b. derive a least squares equation for the data plotted in (a). c. find the concentration of phenobarbital from the equation in (b). d. calculate a standard deviation for the concentration obtained in (c).
For a reaction where Rate = k[CV]1[OH]0, what would be the effect of halving the hydroxide ion concentration while doubling the crystal violet concentration?
What are the necessary conditions for a metal isotope to be useful as a sources in mossbauer spectroscopy.
What is the molar extinction coefficient if the pathlength of the sample cell is 5.6mm and the absorbance of 62.5 M solution is 0.222? 6.342X10-3 L mole- cm- 6.342X10-3 L mole- mm- 6.342X10-4 L mole- mm- 6.342X10-4 L mole- cm-