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Follow-up questions 1. What is the purpose of the lid on the colorimeter?

Follow-up questions 1. What is the purpose of the lid on the colorimeter?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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**Follow-up Questions** 1. What is the purpose of the lid on the colorimeter? 2. In part 1, why is it necessary to calibrate absorbance at every wavelength? 3. In part 1, the concentration of the CV⁺ stock solution was 12.5 µM. What mass of CV⁺ is found in 1 liter of this solution? Give your answer in milligrams. (The molar mass of crystal violet is 407.97 g/mol.) 4. What are the effects of the following changes on molar absorptivity? (a) when the concentration of CV⁺ changes? (b) during the course of the color-loss reaction? (c) when absorbance is measured at different wavelengths? 5. In part 2, what labware or apparatus would you use to prepare solutions for the standard curve? 6. In part 3, what percentage of the NaOH is left at the end of the color-loss reaction, assuming all the crystal violet has reacted? Show your calculation. 7. (a) In part 3, how long is the half-life of the color-loss reaction (show the calculation)? (b) In part 4, is the half-life of the color-loss reaction affected by changing the concentration of NaOH? And how is the half-life affected?
Transcribed Image Text:**Follow-up Questions** 1. What is the purpose of the lid on the colorimeter? 2. In part 1, why is it necessary to calibrate absorbance at every wavelength? 3. In part 1, the concentration of the CV⁺ stock solution was 12.5 µM. What mass of CV⁺ is found in 1 liter of this solution? Give your answer in milligrams. (The molar mass of crystal violet is 407.97 g/mol.) 4. What are the effects of the following changes on molar absorptivity? (a) when the concentration of CV⁺ changes? (b) during the course of the color-loss reaction? (c) when absorbance is measured at different wavelengths? 5. In part 2, what labware or apparatus would you use to prepare solutions for the standard curve? 6. In part 3, what percentage of the NaOH is left at the end of the color-loss reaction, assuming all the crystal violet has reacted? Show your calculation. 7. (a) In part 3, how long is the half-life of the color-loss reaction (show the calculation)? (b) In part 4, is the half-life of the color-loss reaction affected by changing the concentration of NaOH? And how is the half-life affected?
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