DETERMINATION OF BIOLOGICAL OXYGEN DEMAND USING THE MODIFIED WINKLER METHOD GUIDE QUESTIONS: 1. What are the pertinent chemical equations in the standardization of sodium thiosulfate solution? 2. Explain the reason for the addition of H2SO4 and excess KI. 3. What is the effect of adding the acid before KI?
DETERMINATION OF BIOLOGICAL OXYGEN DEMAND USING THE MODIFIED WINKLER METHOD GUIDE QUESTIONS: 1. What are the pertinent chemical equations in the standardization of sodium thiosulfate solution? 2. Explain the reason for the addition of H2SO4 and excess KI. 3. What is the effect of adding the acid before KI?
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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Chemistry
DETERMINATION OF BIOLOGICAL OXYGEN DEMAND USING THE MODIFIED WINKLER METHOD
GUIDE QUESTIONS:
1. What are the pertinent chemical equations in the standardization of sodium thiosulfate solution?
2. Explain the reason for the addition of H2SO4 and excess KI.
3. What is the effect of adding the acid before KI?
4. Present the pertinent chemical equations involved in the analysis.
5. Explain the stepwise production of titratable 12 from dissolved Oz in the sample.
6. Explain why the reagents are added in the specific sequence described in the experiment.
7. Explain the would-be effects (if any) of the following considerations:
a. Water sample was made to stand overnight before analysis
b. MnSO4 was added and the solution was made to stand overnight before the analysis
8. What are the possible sources of errors and their effect on the calculated parameters?
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