f you were plotting a graph of light absorbance versus the concentration of Cu2+ in a solution, which of these would be a suitable label for the x-axis? Select one: a. conc b. [Cu2+] c. [Cu2+]/mol/L d. [Cu2+] (mol/L) e. conc (mol/L)
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f you were plotting a graph of light absorbance versus the concentration of Cu2+ in a solution, which of these would be a suitable label for the x-axis?
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- 3. What is the purpose of using blank before measuring the absorbance of a substance?Match the species on the left (a-e) with their corresponding colors on the right (1-5): a) Hg2Cl2 1. Green b) PbCrO4 2. Black c) NiS 3. Yellow d) (NiCl4)2- 4. Brown e) Fe(OH)3 5. WhiteSolutions that contain the FeSCN2+ ion are blood red (you will see this at the end of the second quarter of lab). Consider the regions of the visible spectrum in which the compound should absorb light and prepare a rough sketch of absorbance vs. wavelength for each solution. Label λ max on the graph. (Is this question asking for the graph of my data at the end)
- 2. Add the absorbance of your Part III solution to the graph. Llse the of best fit of your qraph to calcuate its line concentration. Concentraton vs Absorbance 1.6 con c: 0.003M 1.4 1.2 0.8 0.6 0.4 0.2 0.0005 0.001 0.0015 0.002 0.0025 0.003 0.0035 Concentration Co.003M) Concentration you have calculated in 2 is CCrO, of Ag CrO4. calculate your experimental ksp of Ag CrO4. = [Cr O4]? Use it to 2. %3D ksp of AgCr Oy = CAg+] [CrO4] Absorbance te OutDoes absorbance increase or decrease as the solution concentration of the absorbing substance increases? A. stays the same B. decreases C. increases31. If the % transmittance of a solution is measured to be 35.2%, what is its absorbance? A) 0.352 B) 0.648 C) 0.547 D) 0.453 E) 2.84
- 4. Determine the percent transmittance of ß-carotene, C40H56 that has an absorbance of 0.5 when analyse using a UV-Visible spectrophotometer. A. 6.83% B. 31.6% C. 0.32% D. 68.3% 5. The equation of Beer Lambert's Law is A = abc. If the 'b' is distance, 'a' is absorptivity, and 'A' is absorbance, what does the 'c' represent? 7. A. Intensity B. Analyte concentration C. Analyte transmittance D. Frequency 6. All the following is an example of photon detectors EXCEPT: A. Vacuum phototube B. Silicon photodiodes C. Bolometers D. Photomultiplier tubes C=0 bond stretch occurs at 1750 cm¹ and C-O stretch occurs at 1100 cm¹ because: A. The C-O has a single bond which is a stronger bond, so it vibrates at a higher frequency than the C=O. B. The C-O has a single bond which is a stronger bond, so it vibrates at a lower frequency than the C=O. C. The C=0 has a double bond which is a stronger bond, so it vibrates at a lower frequency than the C-O. D. The C-O has a double bond which is a stronger bond,…. Describe your results. What is the shape of the graph of absorbance vs concentration? What does this tell us about crystal violet solutions?Which is TRUE for spectroscopy of a mixture? A. The absorbance for a mixture at a particular wavelength is the sum of the absorbances for the components that absorb at the particular wavelength. B. Spectrophotometers can differentiate between mixture components that absorb at the same wavelength. C. Each component in a mixture has the same molar absorptivity at the same wavelength. D. The concentration for each component in a mixture is easily calculated by least squares for guesses of each component when the individual spectra are well resolved.
- Which of the following explains why a more concentrated dye solution has a higher absorbance? A. There are more dye molecules in the solution so more isotopes reach the detector. b. There are more isotopes in solution to emit photons. c. There are more dye molecules in solution to emit isotopes. d. There are more isotopes in solution to emit protons. e. There are more dye molecules in the solution to absorb photons.1. Virtual Lab Question: A solution of 0.0040 M copper dithizone transmits 66 % of the light at a particular wavelength in a cell of 1.5 cm thickness. What is the absorbance? What is the molar absorptivity? What is the concentration of a copper dithizone solution that transmits 20 % under the same conditions?A solution of a dye with an absorptivity coefficient (ε) of 3.75 x 102 M-1cm-1 had an absorbance of 0.039 measured in a cell whose width is 1.00 cm. What is the concentration of the dye in the solution? a. 1.46 x 10-3 M b. 1.04 x 100 M c. 1.04 x 10-4 M d. 1.46 x 101 M