In a cell, 0.50 mL of 0.75 M NaOCl and 2.50 mL of 5.50 x 10-6 M aqueous dye were mixed. The pseudo order was applied and the absorbance was measured as a function of time. By plotting In [Tint] as a function of time in seconds, a graph with a linear trend is obtained whose slope is -0.0354 s-1. If the order with respect to NaOCI is 1, what is the value of the rate constant in M-1s-1? а. 6.44 х 103 М-1s-1 b. 0.47 M-1s-1 С. 7.72 x 103 M-1s-1 d. 0.28M-1s-1

In a cell, 0.50 mL of 0.75 M NaOCl and 2.50 mL of 5.50 x 10-6 M aqueous dye were mixed. The pseudo order was applied and the absorbance was measured as a function of time. By plotting In [Tint] as a function of time in seconds, a graph with a linear trend is obtained whose slope is -0.0354 s-1. If the order with respect to NaOCI is 1, what is the value of the rate constant in M-1s-1? а. 6.44 х 103 М-1s-1 b. 0.47 M-1s-1 С. 7.72 x 103 M-1s-1 d. 0.28M-1s-1

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

Chapter15: Molecular Luminescence Spectrometry

Section: Chapter Questions

Problem 15.15QAP: The following lifetimes were measured for the chloride quenching of quinine sulfate given in Example...

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The following lifetimes were measured for the chloride quenching of quinine sulfate given in Example 15-1.The fluorescence intensities are given in the example. (a) Plot fluorescence intensity versus [Cl-]. (b) Plot the ratio of intensity to lifetime, F- versus [Cl-]. (c) Develop a normalization factor to correct the measured fluorescence intensity to that of the solution without quencher. (d) Plot on the same graph Fversus [Cl-] and Fcorr versus (CI-].
In a cell, 0.50 mL of 0.75 M NaOCl and 2.50 mL of 5.50 x 10-6 M aqueous dye were mixed. The pseudo order was applied and the absorbance was measured as a function of time. By plotting ln [Tint] as a function of time in seconds, a graph with a linear trend is obtained whose slope is -0.0354 s-1. If the order with respect to NaOCl is 1, what is the value of the rate constant in M-1s-1?
6. Blue Blue dye stock solution 0.293 M Absorbance at 630 nm 0.00265 Calibration curve y = 0.0833x A solution is prepared by diluting 2.79 mL of the blue dye stock solution to 25.00 mL. The measured absorbance for the prepared solution is listed in the data table. (a) What is the theoretical molar concentration? [Blue]theoretical x 10 |M (b) What is the experimental molar concentration? [Blue]experimental x 10 M (c) What is the percent error? Percent error (blue) = %
What is the pathlength in centimeters when the molar absorptivity for a given absorbing species is 1.32 x 103 L mol-1 cm-1, the concentration is 0.000923 M, and the absorbance is 0.493?
Exactly 5.00 mL aliquots of a solution containing analyte X were transferred into 50.00-mL volumetric flasks and the pH of the solution is adjusted to 9.0. The following volumes of a standard solution containing 2.00 µg/mL of X were then added into each flask and the mixture was diluted to volume: 0.000, 0.500, 1.00, 1.50 and 2.00 mL. The fluorescence of each of these solutions was measured with a fluorometer, and the following values were obtained: 3.26, 4.80, 6.42, 8.02 and 9.56, respectively. ii. Using relevant functions in Excel, derive a least-squares equation for the data, and use the parameters of this equation to find the concentration of the phenobarbital in the unknown solution.
An unknown concentration of [FeSal]+ gave an absorbance reading of 0.301. Calculate the concentration of the solution, given that the slope of the standard curve was 1280 and the y intercept was -0.00821.
5. A solution of certain dye has a calibration graph shown below when measured at 425 nm in 1.00cm cells. A sample of the dye with an unknown concentration has an absorbance of 0.733. Determine the molar absorptivity of the dye at 425 nm and the concentration of the dye in the unknown solution. Absorbance vs. Concentration 1.200 1.100 1.000 0.900 0.800 0.700 0.600 0.500 0.400 1.50E-05 2.50E-05 3.50E-05 4.50E-05 5.50E-05 6.50E-05 Dye Concentration (Mol/L)
The max of aspirin (molar mass 180g/mol) in neutral solution is 225 nm and & is 650 mol-¹Lcm ¹. An absorbance of 1.80 was measured for a solution of aspirin, with a 1 cm path length. Calculate the concentration of the aspirin solution.
Quinine in a 1.553-g antimalarial tablet was dissolved in sufficient 0.10 M HCl to give 250 mL of solution.A 10.00-mL aliquot was then diluted to 50.00 mL with the acid. The fluorescence intensity for the dilutedsample at 347.5 nm provided a reading of 196 on an arbitrary scale. A standard 100-ppm quinine solutionregistered 125 when measured under conditions identical to those for the diluted sample. Calculate the massin milligrams of quinine in the tablet.
Trace amounts of rare clements are found within groundwater and are of interest to goochemists. Earopium and terbium are 30 - lanthanide-scries clements that can be measured from the intensity of their fluorescence emittcd when a solution is illuminated with ultraviolet radiation. Certain organic 25 - compounds that bind Eu(III) and Tb(IIl) enhance the cmission, and substances found in natural waters can decrease 20- the cmission. For that reason it is necessary to use standard Eu (II) additions to the sample to correct for such interference. The graph shows the result of such an cxperiment in which the 15- concentration of Eu(III) and Tb(III) was mcasured in a sample of groundwatler. The x-intercept of the Eu(III) plot is 10- -23.1 ml. and the x-intercept of the Th(III) plot is -9.91 ml. In cach case, 10.00 ml. of the sample solution and 15.00 ml. 5- Tb (III) of an organic additive were added to a scries of live 50 ml. volumctric flasks. The standard Eu(lI) or Th(III) solution (0,…
A student prepared a sample of Molecule VeryRed at 59.0 MM, and measured with the absorbance at 550 nm with a path length of 0.760 cm. The measured absorbance was 0.451 after subtracting the blank. Calculate the molar absorptivity of Molecule VeryRed (in M-1 cm-1).
Extinction coefficient of a dye is 7200 M-1 cm-1. Assuming a path length of the cuvette to be 1 cm, what is the concentration of solution when the absorbance is 0.300 at 500 nm.