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2. The molar absorptivity of compound A & B were measured with pure solutions as follows: wavelength (nm) ɛa (M'cm-l) 2139 EB (M-'cm-') 8469 312 417 10892 4325 (a) Calculate the frequency at wavelength of 312 nm and 417 nm. What wavelength has the greatest frequency? What wavelength has the greatest energy (show your calculation)? (b) A mixture of compound A and B in a 1.00 cm cell had an absorbance of 0.543 at 312 nm and 0.762 at 417 nm. Find the concentrations of A and B in the sample.

2. The molar absorptivity of compound A & B were measured with pure solutions as follows: wavelength (nm) ɛa (M'cm-l) 2139 EB (M-'cm-') 8469 312 417 10892 4325 (a) Calculate the frequency at wavelength of 312 nm and 417 nm. What wavelength has the greatest frequency? What wavelength has the greatest energy (show your calculation)? (b) A mixture of compound A and B in a 1.00 cm cell had an absorbance of 0.543 at 312 nm and 0.762 at 417 nm. Find the concentrations of A and B in the sample.

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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2. The molar absorptivity of compound A & B were measured with pure solutions as follows: wavelength (nm) Ea (M'cm-') 2139 EB (M-'cm-') 8469 312 417 10892 4325 (a) Calculate the frequency at wavelength of 312 nm and 417 nm. What wavelength has the greatest frequency? What wavelength has the greatest energy (show your calculation)? (b) A mixture of compound A and B in a 1.00 cm cell had an absorbance of 0.543 at 312 nm and 0.762 at 417 nm. Find the concentrations of A and B in the sample. 3. Given the molar absorptivity of a pH indicator at 525 nm is 16884 M-'cm for In and 1125 M-'cm- for HIn, calculate the pKa of the indicator if the absorbance of a 8.40 X 105 M solution of the indicator at pH 5.48 is 0.412 using a 1.00 cm cell.
Transcribed Image Text:2. The molar absorptivity of compound A & B were measured with pure solutions as follows: wavelength (nm) Ea (M'cm-') 2139 EB (M-'cm-') 8469 312 417 10892 4325 (a) Calculate the frequency at wavelength of 312 nm and 417 nm. What wavelength has the greatest frequency? What wavelength has the greatest energy (show your calculation)? (b) A mixture of compound A and B in a 1.00 cm cell had an absorbance of 0.543 at 312 nm and 0.762 at 417 nm. Find the concentrations of A and B in the sample. 3. Given the molar absorptivity of a pH indicator at 525 nm is 16884 M-'cm for In and 1125 M-'cm- for HIn, calculate the pKa of the indicator if the absorbance of a 8.40 X 105 M solution of the indicator at pH 5.48 is 0.412 using a 1.00 cm cell.
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