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
Concept explainers
Question
Chapter 17, Problem 17.11QAP
Interpretation Introduction
Interpretation:
The path length of the cell 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 solutionStudents have asked these similar questions
At 520 nm with a 1.00 cm cell a 8.24 ppm solution of KMnO4 has a transmittance of 0.126. What is the molar absorptivity of KMnO4 at 520 nm?
A Dubosq colorimeter consists of a cell of fixed path length and a cell of variable path length. By adjusting the length of the latter until the transmission through the two cells is the same. the concentration of the second solution can be inferred from that of the former. Suppose that a plantdye of concentration 25 μg dm-3 is added to the fixed cell. the length of which is 1.55 em. Then a solution of the same dye. but of unknown concentration. is added to the second cel l. It is found that the same t ransmittance is obtained when the length of the second cel l is adjusted to 1.18 em. What is the concentration of the second solution?
The molar absorptivity for aqueous solutions of phenol at 211 nm is 6.17 × 103 L cm-1 mol-1.
Calculate the permissible range of phenol concentrations if the transmittance is to be less than 85% and greater than 7% when the measurements are made in 1.00-cm cells.
Chapter 17 Solutions
Principles of Instrumental Analysis
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, chemistry and related others by exploring similar questions and additional content below.Similar questions
- 3arrow_forward1. A compound has a molar absorptivity of 3.031 x 10° L cm1 mol1. If a 15.00 mm-length cell is used to hold the sample, and a transmittance of 19.53 % is measured, what is the molarity of the compound in solution?arrow_forwardA solution containing 5ppm KMNO4(F.W.159) has a transmittance of 0.360 measured in 1 cm cell at 500 nm. The molar absorptivity of KMNO4 in L mole1 cm 1 is: O 1.1 x 104 1.9 x 104 1.4 x 104 2.7 x 104arrow_forward
- . What is the molar absorptivity when the percent transmittance is 56.2%, the pathlength is 2.00 cm, and the concentration is 0.0000748 M?arrow_forwardFind the concentration of a solution with a transmittance of 0.27 AU and molar absorptivity of 3.65 x 104 M- cm in a 1.00 cm cell.arrow_forward(a) You measure the percent transmittance of a solution containing chromophore X at 400nm in a 1-cm path length cuvette and find it to be 50%. What is the absorbance of this solution? (b) What is the molar absorptivity of chromophore X if the concentration of X in the solution measured in question (a) is 0.5mM? (c) What is the concentration range of chromophore X that can be assayed if, when using a sample cell of path length 1, you are required to keep the aborbance between 0.2 and 0.8?arrow_forward
- A inorganic compound whose concentrations is 0.013 M in a 1 cm pathlength cell has transmittance of T=8.23%.(i) Find the absorbance (A) and(ii) The molar absorptivity.arrow_forwardThe molar absorptivity for aqueous solutions of phenol at 211 nm is 6.17 x 103 L cml mol-'. Calculate the permissible range of phenol concentrations if the transmittance is to be less than 85% and greater than 7% when the measurements are made in 1.00-cm cells.arrow_forwardA solution containing 8.75 ppm KMnO4 has a transmittance of 0.743 in a 1.00 cm cell at 520 nm. Calculate the molar absorptivity of KMnO4.arrow_forward
- 7) A 25.0 ml sample containing Cu gave an instrument reading of 23.6 units (corrected for a blank). When exactly 0.500 ml of 0.0287M Cu(NO3)2 Was added to the solution,the signal increased to 37.9 units. Calculate the molar concentration of Cu" in the sample +2,arrow_forwardnumber 20, is this correct?arrow_forwardSolutions of fluorene (diphenylmethane) in benzene can be analyzed by making use of its absorbanceat 301 nm wavelength. If a solution of fluorene of unknown concentration in benzene exhibits anabsorbance of 0.720 in a 1.00-cm cuvette cell. What is the concentration of fluorene? (Ans. c = 6.55x10 -5 M)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