3. A solution is prepared by mixing 1.00 mmol of a weak acid (HA, pK2 = 6.44) with an unknown amount of KOH. The solution is diluted to 1.00 L using deionized water. An aliquot of the solution is placed in a 1.00-cm cuvet. The absorbance of the solution at 285 nm is 0.7748. Using the measured absorbance value, calculate the concentrations of HA and A in the solution. Then calculate the pH of the solution. You may assume all activity coefficients are equal to unity. НА A- 2050 Molar absorptivity at 285 nm (M² cm) 456

3. A solution is prepared by mixing 1.00 mmol of a weak acid (HA, pK2 = 6.44) with an unknown amount of KOH. The solution is diluted to 1.00 L using deionized water. An aliquot of the solution is placed in a 1.00-cm cuvet. The absorbance of the solution at 285 nm is 0.7748. Using the measured absorbance value, calculate the concentrations of HA and A in the solution. Then calculate the pH of the solution. You may assume all activity coefficients are equal to unity. НА A- 2050 Molar absorptivity at 285 nm (M² cm) 456

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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Spectroanalytical Methods

Spectroanalytical methods measure the wavelength and intensity of radiations that are either emitted or absorbed by a molecular or atomic species. These methods are useful for evaluating the electronic or atomic arrangement of the molecules of a given analyte.

Question

3. A solution is prepared by mixing 1.00 mmol of a weak acid (HA, pka =6.44) with an
unknown amount of KOH. The solution is diluted to 1.00 L using deionized water. An
aliquot of the solution is placed in a 1.00-cm cuvet. The absorbance of the solution at
285 nm is 0.7748. Using the measured absorbance value, calculate the concentrations
of HA and A in the solution. Then calculate the pH of the solution. You may assume all
activity coefficients are equal to unity.
НА
A-
Molar absorptivity at 285 nm (M1 cm)
456
2050

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