Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 17, Problem 17.10QAP
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.
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Chapter 17 Solutions
Principles of Instrumental Analysis
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- The absorbances of solutions containing K2CrO4 in 0.05 M KOH were measured in a 1.0-cm cell of 375 nm. The following results were obtained: Calculate the linear equation of the calibration curve.arrow_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_forwardExplain why small uncertainties in the measured potential of ISEs can cause large errors in the determined analyte concentration.arrow_forward
- The measured absorbance of a solution held in a sample container witha path length of 3 cm is 0.96. What is the concentration of the solution if the molar absorptivity of this analyte is 139 L Mol1cm 1?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_forwardQ/ The intensity of the incident light radiation is reduced by 20% when it passes through a 1 cm wide cell that contains an absorbing medium. What is the percentage reduction when the radiation passes through the same medium if the cell width is 5 cm?arrow_forward
- 5. Calculate the conductance and the conductivity of a metal if the resistivity of the metal is 2.824 x 108 Q.m, with resistance of 9.0 x 10 Q when current is 1.25 A.arrow_forwardDiscuss the advantages, disadvantages, and limitations of the technique of cyclic voltammetry in both qualitative and quantitative measurements.arrow_forwardCalculate the expected absorbance value of a 0.39 M aqueous solution of a solution if the extinction coefficient is ε = 2.95 dm3 mol–1 cm–1. The path length of the solution cell used for the measurement is 1.00 cm.arrow_forward
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