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 12, Problem 12.7QAP
Interpretation Introduction
Interpretation:
X-ray absorption measurement for Ag kα line is done by considering Al foil as a window for cell. 2.74 is the mass absorption coefficient for Al at the given wavelength and the density for this is 2.70 g/cm3. For the fabrication of window with Al foil, maximum thickness of aluminum foil needs to be determined with the condition that the absorption done by them is not more than 2.8%.
Concept introduction:
Concept of Beer’s law will be used. This is given by the following formula-
Expert Solution & Answer
Trending nowThis is a popular solution!
Students have asked these similar questions
Why is 800nm used for the wavelength when measuring the absorbance of the blue copper II sulfate solution?
Photobromination of cinnamic acid to dibromocinnamic acid was carried out in blue light of wavelength 440nm at 35degree celsius using light intensity of 1.5 *10 power -3 joule per second. An exposure of 20 minutes produces a decrease of 0.075 millimoles of bromine. The solution absorb 80% of light passing through it. Calculate the quantum yield of the reaction.
What are the advantages and disadvantages of using quantum dots for fluorescence imaging?
Chapter 12 Solutions
Principles of Instrumental Analysis
Knowledge Booster
Similar questions
- A 2.845 g sample of an unknown compound containing cobalt(II) ion was dissolved in water in a 250 mLvolumetric flask. The absorbance of this solution was found to be 0.2195 at 515 nm in a 1 cm cell.Using the values of absorbance obtained, calculate the percentage of cobalt in the unknown compound.arrow_forwardOn February 18, the news Mars rover landed in the Herezo Crater. It communicates with Earth via radio waves with a wavelength of 3 cm. Calculate the amount of time for this electromagentic radiation to transverse the distance of 225 x 10^6 km between Earth and Mars.arrow_forwardThe electromagnetic spectrum of an analytical sample showed absorption at 3200 cm^-1. calculate the wavelength in nm and which region of the electromagnetic spectrum does it belong to?arrow_forward
- Compare the energy (in joules) carried by an X-ray pho- ton (wavelength A = 0.20 nm) with that carried by an AM radio wave photon (A = 200 m). Calculate the 1.00 mol of each type of photon. What effect do you expect each type of radiation to have for inducing chemi- cal reactions in the substances through which it passes? energy ofarrow_forwardMatch each statement with one or more of the following: flame AA, flame photometry, atomic fluorescence, ICP, graphite furnace AA, and spark emission. (a) The technique that uses a partially ionized stream of argon gas called a plasma - (b) The technique in which a light source is used to excite atoms, the emission from which is then measured - (c) The three techniques that require light to be directed at the atomized ions - (d) The technique that utilizes a solid sample - (e) The four techniques that measure some form of light emission by excited atoms present in an atomizer - (f) The absorption technique in which the atoms are in the path of the light for a relatively short time - (g) The technique in which the emitting source may reach a temperature of 6000 K -arrow_forwardCalculate the frequency of green light with a wavelength of 517 nm. A/ Paragraph B I Ev O 80 :arrow_forward
- A student combines Fe(NO3)3 solution and KSCN solution to produce a solution in which the initial concentrations of Fe3+(aq) and SCN–(aq) are both 7.9 × 10–3 M. The absorbance of this solution is measured, and the equilibrium FeSCN2+(aq) concentration is found to be 1.8 × 10–3 M. Fe3+ + SCN- <=> FeSCN2+ Determine the equilibrium constant for the above reactionarrow_forward1. Write the mathematical expression for Beer's law and explain each symbol in the expression. 2. Use Figure 7.2 to estimate the approximate wavelength of maximum absorption for an aque- ous solution of each of the following: Hemoglobin (the molecule that gives blood its color) a. nm Chlorophyll (the pigment that gives algae their color) b. nm Fill in the following for the correspondence between % transmittance and absorbance: 3. 1.00 absorbance absorbance 100.0 % T 1 % T 0.50 absorbance = absorbance 50.0 % T =arrow_forwardSuppose that absorbances of several solutions were measured at 520nm. What is the frequency of this wavelength? What is the energy of this wavelength? h = 6.626 x 10^-34 J • s)arrow_forward
- (c) The kinetic energy, KE, of electrons emitted from a metal surface after irradiation with UV light of wavelength A is given by: hc Kε = 7-9 where h is Planck's constant (6.626 x 10-4 Js), c is the speed of light in a vacuum (2.99 x 108 m s¹), and is the work function of the metal surface. In a specific experiment, light with a wavelength of 266 nm was used to irradiate a cadmium (Cd) metal surface. Calculate the photon energy of the light used in the experiment, in Joules. (1) ₂4arrow_forwardIn photoelectron spectroscopy, an electron is ejected from an atom by the collision of a UV photon with the surface of the atom. The equation describing this reaction is similar to the photoelectric effect described by Einstein: hv = ½ mv + Ei, where E; is the ionization energy of the atom. In one experiment on potassium, the kinetic energy of the ejected electron was 5.34 x 10ºJ when the UV source had a wavelength of 162 nm. Calculate the ionization energy of potassium. -19arrow_forwardA solution containing 3.75mg/100 ml of analyte (X) 220 g/mol has a transmittance of 39.6% in a 1.00 cm cell at 480 nm. Calculate a) The molar absorbtivity of X. b) The fraction of light transmitted from a solution three times the mentioned concentration.arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
- Chemistry for Engineering StudentsChemistryISBN:9781337398909Author:Lawrence S. Brown, Tom HolmePublisher:Cengage Learning
- General Chemistry - Standalone book (MindTap Cour...ChemistryISBN:9781305580343Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; DarrellPublisher:Cengage Learning
Chemistry for Engineering Students
Chemistry
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Cengage Learning
General Chemistry - Standalone book (MindTap Cour...
Chemistry
ISBN:9781305580343
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Publisher:Cengage Learning