(a)
Interpretation:
The absorbance that minimizes the concentration uncertainty is to be stated.
Concept introduction:
The molecular absorption spectroscopy is the device that measures the transmittance and absorbance of the solution in the transparent container. The transparent container or cell having path length
Beer’s law shows the linear relation between the absorbance and concentration of the observing analyte.
Here,
(b)
Interpretation:
The expression for transmittance and absorbance that minimizes the concentration uncertainty is to be stated.
Concept introduction:
The molecular absorption spectroscopy is the device that measures the transmittance and absorbance of the solution in the transparent container. The transparent container or cell having path length
Beer’s law shows the linear relation between the absorbance and concentration of the observing analyte.
Here,
(c)
Interpretation:
Whether the spectrophotometer was operating under Case I, Case II or Case III conditions is to be stated.
Concept introduction:
The molecular absorption spectroscopy is the device that measures the transmittance and absorbance of the solution in the transparent container. The transparent container or cell having path length
Beer’s law shows the linear relation between the absorbance and concentration of the observing analyte.
Here,
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Principles of Instrumental Analysis
- Differentiate the following compounds using FTIR spectrophotometer.Explain the principle of FTIR instrument.arrow_forward" Spectrophotometric analysis" refers to methods that are based on light absorbance. O True Falsearrow_forwardDefine the following terms: spectrophotometer, absorbance, pathlength, & (also known as molar absorptivity), concentration, transmittance, Beer's law. RODUCTION:arrow_forward
- 5. Draw and label a box diagram for a double-beam spectrophotometer. What advantages does a double beam spectrophotometer have over a single beam spectrophotometer?arrow_forward(a) What is the main difference between a UV-Vis spectrophotometer and a spectrofluorometer? (b) What is the main advantage of using a spectrofluorometer in quantitative analysis?arrow_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
- d) Doppler broadening is a source of line broadening in the flame of an atomic absorption instrument, λ = 20 (7x10-7)(0.5. Find the Doppler line width for the absorption line λ = 248.3 nm of Fe in a 2500 K flame (T), where M is the mass of the atom (56 Da).arrow_forwardA student prepared several solutions of an unknown molecule, each at a different concentration. The absorbance of each solution was measured at 630 nm with a path length of 0.760 cm. The student then plotted the absorbance of each sample vs. its concentration (in uM), and found a best-fit line of y = 0.00626x + 0.00732. Calculate the molar absorptivity of the unknown molecule (in M-1 cm-1).arrow_forwardIn the analysis conducted with flame AAS, standard solutions of the X-type are analyzed individually and the absorbance values obtained are plotted against concentration (ppm). It was seen that the slope of the calibration line obtained was 0.0925. The standard deviation of the absorbance values obtained by reading the blank 10 times under the same conditions was calculated as 0.00183 ppm. According to this; For the X-type calculate the following: a) LOD b) LOQ c) Sensitivityarrow_forward
- State the difference between transmittance, absorbance, and molar absorptivity. Which one is proportional to concentration?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
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning