A 4.48 mg sample of a compound has a molar mass of 158.03 g/mol was dissolved in a 1000 mL volumetric flask. A 1.00 mL aliquot was withdrawn, placed in a 10.00 mL volumetric flask, and diluted to the mark. A 10.00 mL aliquot was placed in a 1.00 cm cell and percent transmittance of 30.9% at 520 nm. Calculate the molar absorptivity of KMnO4, at 520 nm

A 4.48 mg sample of a compound has a molar mass of 158.03 g/mol was dissolved in a 1000 mL volumetric flask. A 1.00 mL aliquot was withdrawn, placed in a 10.00 mL volumetric flask, and diluted to the mark. A 10.00 mL aliquot was placed in a 1.00 cm cell and percent transmittance of 30.9% at 520 nm. Calculate the molar absorptivity of KMnO4, at 520 nm

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

Chapter1: Introduction

Section: Chapter Questions

Problem 1.11QAP

See similar textbooks

Similar questions

A 50 mL aliquot of river water is treated with a conditioning solution, which is stirred and recorded at 500 nm. The equipment reading indicated 40.5% Transmittance with 1.5 cm optical path cuvettes. Calculate the ppm of sulfate (PM 96 g / mol) in river water if a standard of 3.0x10-5 mol / L of sulfate, under the same conditions, gave 55% Transmittance in cuvettes with 1.5 cm of passage. optical.
The transmittance of a solution measured at 590 nm in a 1.5-cm cuvette was 76.2%. (a) What is the corresponding absorbance?(b) If the concentration is 0.0802 M, what is the absorptivity of this species at this wavelength? (c) If the absorptivity is 10,000 L mol-1 cm-1, what is the concentration?
You are given two containers, one with 3.00 mg Mn 2+ and one with an unknown amount of Mn 2+ .You oxidize the Mn 2+ to the purple permanganate ion (MnO 4 - ) and dilute the solutions to 250.0 mLs.The solution containing the 3.00 mg Mn is used to prepare a third solution containing 1.50 mg Mn.The transmittances of the solutions are measured at 530 nm using a dilapidated Spectronic 20. Fromthe data below, calculate the amount of Mn in the unknown. For a linear curve, consider y=kx+b Mn (mg) %T3.00 30.81.50 55.2Unknown 37.4
UV-Visible spectroscopy is used to determine the content of an analyte in a capsule. Weigh 100.0 mg of the capsule contents (total weight of contents 500 mg), add 2.0 mL of 0.05 M NaOH, filter the flask, and make up to 25.00 mL with NaOH. The measured transmittance of this solution is 33.0%. The analyte standard is prepared by dissolving 10.0 mg of standard in 25.00 mL of 0.05 M NaOH, then taking 10.00 mL of that solution and diluting to a final volume of 50.00 mL where the transmittance is obtained from 44.0%. Calculate the content of the analyte in the capsule.
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.
0.1120 g of a solid sample containing copper was dissolved by acid and transferred to a 250.00 mL volumetric flask and volume was made up with distilled water. The solution was then diluted by a factor of 25. The final solution was analyzed by atomic absorption spectrophotometry and the concentration was found be 2.982 ppm, What is the weight percentage of copper in the original solid sample? Keep four significant figures in your final answer.
a solution of 5.47 ppm kmno4 has a transmittance of 0.409 in a 1 cm at 520nm. Calcualate the molar absorptivity of KMnO4 Express in 5 SF
A 2.50-mL aliquot of a solution that contains 3.8 ppm iron(III) is treated with an appropriate excess of KSCN and diluted to 50.0 mL. What is the absorbance of the resulting solution at 580 nm in a 2.50-cm cell? See Problem 14-21 for absorptivity data. See Problem 14-21 for absorptivity data: A solution with a "true" absorbance [A = log(P0 / P)] of 2.10 was placed in a spectrophotometer with a stray light level (Ps/P0 ) of 0.75% What absorbance A’ would be measured? What percentage error would result?
List the desirable characteristics of HPLC detectors.
Lead in dry river sediment was extracted with 25 wt% HNO3 at incubation temperatures for 1 hr. Then 1 mL of filtered extract was combined with other reagents to a total of 4.60 mL. Pb+2 was measured by an electrochemical method by spiking with 2.50 ppm Pb2+. added vol. of 2.50ppm Pb2 signal 0 mL 1.10 0.025 mL 1.66 .050 mL 2.20 .075 mL 2.81 what is Sx based on Sy
A spectrophotometer method for the quantitative analysis of Pb2+ in blood uses Cu2+ as an internal standard. A standard containing 1.75 ppb Pb2+ and 2.25 ppb Cu2+ yields a signal of 0.832 for Pb2+ and a signal of 0.351 for Cu2+. A sample of blood is spiked with the same concentration of Cu2+, giving a signal of 0.520 for Pb2+ and 0.289 for Cu2+. Determine the concentration of Pb2+ in the sample of blood.
3.) The accuracy of a spectrophotometer is evaluated by preparing a solution of 60.06 ppm K2Cr2O7 and measuring its absorbance at a wavelength of 350 nm in a cell with a pathlength of 1.00 cm. The expected absorbance is 0.640. What is the expected molar absorptivity of K2Cr2O7 at this wavelength? 4.) A solution’s transmittance is 35.0%. What is the transmittance if you dilute the solution to half of its initial concentration?