Concept explainers
(a)
Interpretation:
The materials as well as instrument components required for making an instrument used to investigate the absorption bands in the given range of wavelength.
Concept introduction:
Spectral lines help in identifying the atoms and molecules. These are result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby.
(b)
Interpretation:
The materials as well as instrument components required for making an instrument used to obtain the absorption spectra in far IR − 20 to 50 µm needs to be suggested.
Concept introduction:
Spectral lines help in identifying the atoms and molecules. These are result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby.
Spectral region consists of different wavelengths which are distinguished based on the sources used to produce them and detect the different wavelengths.
(c)
Interpretation:
The materials as well as instrument components required for making an instrument used to make a portable device to determine the iron content in natural water depending on absorption of radiation by red Fe(SCN)2+ complex needs to be suggested.
Concept introduction:
Spectral lines are lines which help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby.
Spectral region consists of different wavelengths which are distinguished based on the sources used to produce them and detect the different wavelengths.
(d)
Interpretation:
The materials as well as instrument components required for determination of nitrobenzene in air samples depending on absorption peak at 11.8µm needs to be suggested.
Concept introduction:
Spectral lines are lines which help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby.
Spectral region consists of different wavelengths which are distinguished based on the sources used to produce them and detect the different wavelengths.
(e)
Interpretation:
The materials as well as instrument components required for making an instrument used to determine the wavelength of flame emission lines for metallic elements in 200 nm to 780 nm region needs to be suggested.
Concept introduction:
Spectral lines are lines which help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby.
Spectral region consists of different wavelengths which are distinguished based on the sources used to produce them and detect the different wavelengths.
(f)
Interpretation:
The materials as well as instrument components required for making an instrument used for spectroscopic studies in vacuum UV region needs to be suggested.
Concept introduction:
Spectral lines are lines which help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby.
Spectral region consists of different wavelengths which are distinguished based on the sources used to produce them and detect the different wavelengths.
(g)
Interpretation:
The materials as well as instrument components required for making an instrument used for spectroscopic studies in the near IR region needs to be suggested.
Concept introduction:
Spectral lines are lines which help in identifying the atoms and molecules. These are a result of absorption or emission of light in a comparatively narrower frequency range compared to the frequencies nearby.
Spectral region consists of different wavelengths which are distinguished based on the sources used to produce them and detect the different wavelengths.
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Chapter 7 Solutions
Principles of Instrumental Analysis
- 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?arrow_forward(A) Calculate the wavelength in nm of an emission line of cadmium with a frequency of 1.311 x 1015 Hz. (B) Calculate the wavenumber in cm-1 of an infrared absorption peak with an associated energy of 5.656 x 10-20 J. Report answers to 4 sig figsarrow_forward(a) Draw a block diagram of an atomic absorption spectrometer (AAS). Briefly describe the function of each components. (b) What is the process of atomization in atomic absorption spectrometer? Describe the steps of the process in the correct sequence. (c) State TWO interferences that are encountered in atomic absorption spectrometer. Suggest ONE solution to overcome the problem. (d.) What is the main difference, in terms of instrumentation, between atomic absorption spectrometer and atomic emission spectroscopy?arrow_forward
- What color would you expect for light transmitted through a solution with an absorption maximum at (a) 450; (b) 550; (c) 650 nm?arrow_forwardThe molar absorptivity (ε) of the FeSCN2+ complex ion is 4700 M-1 · cm-1 at a wavelength of 450 nm. Using a 1-cm sample tube, you measure the absorbance as (2.0x10-1). What is the concentration of FeSCN2+?arrow_forwardTo measure the absorbance of Fe(SCN)2+, write a procedure (detailed in steps) to accurately determine which wavelength/LED colour setting to use on the Vernier GoDirectTMarrow_forward
- Iron(III) forms a complex with thiocyanate ion that has the formula Fe(SCN)+2. The complex has an absorption maximum at 580nm. A sample of well water was assayed according to the following scheme: Sample Sample Vol (mL) Oxidizer Fe(ii) (mL) added 2.75ppm KSCN (0.050 M) H20 (mL) Abs @ 580 nm 1 50.00 5.00 5.00 20.00 20.00 .549 2 50.00 5.00 0 20.00 25.00 .231 What is the concentration of Fe in the well water sample?arrow_forwardThe absorption coefficient of a glycogen-iodine complex is 0.20 at light of 450 nm. What is the concentration when the transmission is 40 % in a cuvette of 2 cm?arrow_forward13arrow_forward
- 2. Two substances, A and B, have the same molar extinction coefficient at 260 nm: 1.80 x 10 dm³mol'cm'. At 340 nm A no longer absorbs, and for B EB = 6.22 x 103 dm³mol'cm'. A solution of the two has an absorbance of 0.215 at 340 nm and 0.850 at 260 nm in a 1 cm thick cell. Calculate the concentrations of A and B.arrow_forwardWhich of two instrumental modes, atomic absorption or atomic emission, results in the better detection of metal ions in general? Describe the processes that can analyte solution goes through during atomization in the graphite furnace?arrow_forwardAtomic absorption spectroscopy with graphite furnace atomization is an extremely sensitive technique. The standard addition method is used with this technique to determine the concentration of copper in urine. A 20.00 mL sample of urine is spiked with 1.00 mL of 300. ppb Cu²+ and this mixture gives a response of 0.168. Another 1.00 mL aliquot of 300. ppb Cu²+ is added to this mixture and gives a reading of 0.235Determine the concentration of copper in the urine samplearrow_forward
- Principles of Instrumental AnalysisChemistryISBN:9781305577213Author:Douglas A. Skoog, F. James Holler, Stanley R. CrouchPublisher:Cengage Learning