Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
expand_more
expand_more
format_list_bulleted
Question
Chapter 17, Problem 17.12QAP
Interpretation Introduction
Interpretation:
The thickness of the polystyrene film should be determined.
Concept introduction:
The path length is a distance travelled by the light through a sample of analytical cell. It is used in the infrared spectroscopy. The path length can change the sample absorbance without changing the concentration of the sample.
The wave number is also used to calculate the path length of cell. The wave is reciprocal of wavelength of absorption. It is number of wave per unit distance.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
The absorbance of a mixture containing compounds A and B was to have an absorbance of 0.24 at 250 nm and
0.965 at 375 nm using a cell with a pathlength of 1 cm.
The molar absorptivity of A and B at the wavelengths are given in the table (M-1cm-1 or mol-1 L cm-1).
Sample
& @250 nm
& @375 nm
850
2000
500
2400
Determine the concentration of each compound.
A
B
The mass spectrum of Compound D, with a molecular formula C8H7BrO2 is shown below.
Draw the most likely ion fragment for the signals at m/z 155, 157, 183, and 185
Identify each signal showed in the spectra for both C3H6O2 and C4H10O. Determine the multiplicity and integrity for each signal.
Chapter 17 Solutions
Principles of Instrumental Analysis
Knowledge Booster
Similar questions
- Please don't provide handwriting solutionarrow_forwardThe concentration of Na* in the sea water sample was determined with atomic fluorescence spectroscopy (AFS). 35.00 mL of the sea water sample produce an AFS signal of 0.425. Then, 5.00 mL of 0.00215 M Nat standard were added to another 35.00 mL of the sea water sample, and this spiked sample gives an AFS signal of 0.724. What would be the concentration of Na* in the sea water sample? 0.0268 M 0.00753 M 0.0109 M 0.587 M 0.00324 Marrow_forwardWhat structural features of Hydroxypropyl Acrylate (HPA) allow it to be detected by HPLC?arrow_forward
- 1. State the difference between transmittance, absorbance, molar absorptivity, and fluorescence. Which one(s) is proportional to analyte concentration?arrow_forwardWhat spectral features might we see with 1000 scans at a resolution of 0.125 cm-1 ?arrow_forwardO Macmillan Learning Co(II) was used as an internal standard to analyze a sample of Ti(IV) with atomic absorption spectroscopy (AAS). A standard mixture containing 1.30 µg Co/mL and 1.48 µg Ti/mL measured by AAS produced a signal-to-signal ratio of 2.13 Ti : 1.00 Co. A mixture was prepared by combining 5.50 mL of a Ti(IV) solution of unknown concentration with 3.50 mL of a 13.4 µg/mL solution of Co(II). The absorbance of the mixture at the Ti(IV) wavelength was 0.139 and the absorbance at the Co(II) wavelength was 0.208. Determine the concentration, in moles per liter, of Ti(IV) in the original unknown solution. concentration: M Ti(IV)arrow_forward
- The answer is D, could someone please explain itarrow_forwardwill be the pattern of the molecular ion peak(s) in the mass spectrum of 3-chloro-methyl-benzene (m-chloro-toluene). M+ at 126; largest peak at 76 M+ at 128; M+2 at 130, ratio 3:1 M+ at 128; M+2 at 130; ration 1:1 M+ at 128 M+ at 126; M+2 at 128, ratio 3:1 QUESTION 14 In a recrystallization, the solute is dissolved in solvent. cold room temperature hot QUESTION 15 Consider the aromatic compound 4-isopropyl-benzonițrile. (Benzonitrile is a benzene ring with the nitrile group on position 1.) How many for non-equivalent types of protons will be in its proton NMR spectrum? 4. 6arrow_forwardDetermining the concentration of unknown solution using uv-vis spectroscopy. The absorbance vs concentration has an equation of straight line of y=8.4052x+0.0002 with r2=1. The unknown solution's absorbance is 0.150. From 75 mL sample, A 15 mL aliquot was examined. The 15 mL aliquot was mixed with 15 mL 1% percent by mass over volume HCl and was diluted to 40 mL with water. What is the concentration of the solution in the 75 mL sample?arrow_forward
- The ppm concentration of Pb2+ in a blood sample were measured with Spectrophotometry. 5.00 mL of a blood sample were taken and this sample gave a signal of 0.301 a.u.. Another 5.00 mL of a blood sample were mixed with 0.50 mL og 1.75 ppm Pb2+. Then, this mixture was diluted to 25.00 mL and this diluted mixture gave a signal of 0.406 a.u.. What is the ppm concentration of a blood sample?arrow_forwardWhat is the chemical shift in ppm of a carbon that resonates at 1325 Hz on a 250 MHz instrument?arrow_forwardSuppose that s = 0.28 nA instead of 0.56 nA, but yblank is still 1.26 nA. Find the signal detection limit, the minimum detectable concentration, and the concentration of analyte in a sample with a signal of 7.0 nA.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning
Principles of Instrumental Analysis
Chemistry
ISBN:9781305577213
Author:Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher:Cengage Learning