You are given a green solution. Sketch the two possible UV-vis spectra that could result from...
You are given a green solution. Sketch the two possible UV-vis spectra that could result from the solution.
Homework Answers
To solve such problems, you need to understand the complementary colour theory. For this example, red is the complementary colour of green. So, if the material show strong absorbance in red range and no other absorbance, it will show green colour. The other option is to show absorbance in orange and violet range for a green material. Spectra are shown below
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You are given a green solution. Sketch the two possible UV-vis
spectra that could result from...
(10 pts total) You are going to collect UV-Vis spectra of an unknown solution of beta...
(10 pts total) You are going to collect UV-Vis spectra of an unknown solution of beta carotene (structure given below) dissolved in hexane. a. (5 pts) You have a choice between a quartz cuvette or a Thallium Bromoiodide (KRS-5) cuvette? Which should you choose and why? The following chart may be useful. KRISTIILTH 100 30000 1000 3000 Wavelength, 0 1000 b. (5 pts) How would taking the spectrum in ethanol affect your spectrum? Explain.
A caffeine sample was diluted by a factor of 100 and UV-Vis spectra of diluted solution...
A caffeine sample was diluted by a factor of 100 and UV-Vis spectra of diluted solution showed Absorbance of 0.240 at 275nm. The concentration of diluted sample was determined as 2.76 × 10−2 mMol. What is the Molar Absorptivity (e) of caffeine at 275nm in dilute and in concentrated solution? Consider thickness of a cuvette – 1cm.
A caffeine sample was diluted by a factor of 1000 and UV-Vis spectra of diluted solution...
A caffeine sample was diluted by a factor of 1000 and UV-Vis spectra of diluted solution showed Absorbance of 0.0340 at 275nm. The concentration of diluted sample was determined as 2.76 × 10-5 Mol. What is the Molar Absorptivity (e) of caffeine at 275nm in both the diluted and concentrated solutions? Consider thickness of a cuvette – 1cm.
DETERMINE the UV, VIS AND IR SPECTRA OF these 6 types of glass Quartz,window glass, window...
DETERMINE the UV, VIS AND IR SPECTRA OF these 6 types of glass Quartz,window glass, window glass with green, window glass with red, window glass with blue, window glass with bright red using wave lenght on y-axis and transmittance on x-axis.
The UV/Vis spectra provided are recorded for 0.15 M solutions of Co(II) and Ni(II). Calculate the...
The UV/Vis spectra provided are recorded for 0.15 M solutions of Co(II) and Ni(II). Calculate the mass of CoCl2.6H2O which would be dissolved in 250 cm3 of water to produce a 0.15 M solution. Would you expect the mass of NiCl2.6H2O required for the equivalent solution to be significantly different, and why?
7. In the past two sections, you have now examined to different types of spectroscopy: UV-Vis...
7. In the past two sections, you have now examined to different types of spectroscopy: UV-Vis and PES. a. Sketch a typical atomic energy level diagram (only considering principle quantum number, n) and draw the excitation accomplished by UV-vis spectroscopy (Ground state -> First excited state) b. In the typical energy level structure above, draw the ionization accomplished by Photoelectron spectroscopy (Ground state -> Ionization)
Imagine that you are given the mass spectra of these two compounds, but the spectra are...
Imagine that you are given the mass spectra of these two
compounds, but the spectra are missing the compound names. Which
peaks occur in one isomer but not in the other isomer? That is,
which peaks could be used to distinguish one isomer from the
other?
Imagine that you are given the mass spectra of these two compounds, but the spectra are missing the compound names. Which peaks occur in one isomer but not in the other isomer? That is,...
1. draw structure of flavin mononucleotide in its reduced state and in its oxidized state a)What do the UV-vis spectra of each of those two forms of flavin look like? Draw or paste a screen shot of ea...
1. draw structure of flavin mononucleotide in its reduced state and in its oxidized state a)What do the UV-vis spectra of each of those two forms of flavin look like? Draw or paste a screen shot of each spectrum below.
A solution of Red Dye 40 is analysed via UV-Vis spectroscopy, and is found to have...
A solution of Red Dye 40 is analysed via UV-Vis spectroscopy, and is found to have an absorbance of 0.192. If the absorp- tion coefficient (£) for Red Dye 40 is 11 502 M2 cm- and the length of the cuvette used is 1.00 cm, what is the concentra- tion of Red Dye 40 in the solution? (You will need to read the pre-lab material to solve this problem.)
Imagine that you are given the mass spectra of these two compounds, but the spectra are missing...
Imagine that you are given the mass spectra of these two compounds, but the spectra are missing the compound names. Which peaks occur in one isomer but not in the other isomer? That is, which peaks could be used to distinguish one isomer from the other?
(10 pts total) You are going to collect UV-Vis spectra of an unknown solution of beta carotene (structure given below) dissolved in hexane. a. (5 pts) You have a choice between a quartz cuvette or a Thallium Bromoiodide (KRS-5) cuvette? Which should you choose and why? The following chart may be useful. KRISTIILTH 100 30000 1000 3000 Wavelength, 0 1000 b. (5 pts) How would taking the spectrum in ethanol affect your spectrum? Explain.
Imagine that you are given the mass spectra of these two
compounds, but the spectra are missing the compound names. Which
peaks occur in one isomer but not in the other isomer? That is,
which peaks could be used to distinguish one isomer from the
other?
Imagine that you are given the mass spectra of these two compounds, but the spectra are missing the compound names. Which peaks occur in one isomer but not in the other isomer? That is,...
A solution of Red Dye 40 is analysed via UV-Vis spectroscopy, and is found to have an absorbance of 0.192. If the absorp- tion coefficient (£) for Red Dye 40 is 11 502 M2 cm- and the length of the cuvette used is 1.00 cm, what is the concentra- tion of Red Dye 40 in the solution? (You will need to read the pre-lab material to solve this problem.)
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