The standardization of same titrant during the determination of BOD5 of water sample was done separately for Day 1 and Day 5. Upon standardization, it turned out that the concentration of the titrant in Day 1 is higher than the concentration of the same batch of titrant in Day 5. How would you explain this discrepancy? The water used to prepare the Na2S2O3 solution was not boiled resulting to proliferation of bacteria. Too much starch indicator was added in the conical flask. Sulfuric acid was added first before potassium iodide. There were bubbles at the tip of the burette during titration.

The BOD5 test, also known as the Biochemical Oxygen Demand test, is a biochemical test that measures…

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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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The standardization of same titrant during the determination of BOD₅ of water sample was done separately for Day 1 and Day 5. Upon standardization, it turned out that the concentration of the titrant in Day 1 is higher than the concentration of the same batch of titrant in Day 5. How would you explain this discrepancy?

The water used to prepare the Na₂S₂O₃ solution was not boiled resulting to proliferation of bacteria.
Too much starch indicator was added in the conical flask.
Sulfuric acid was added first before potassium iodide.
There were bubbles at the tip of the burette during titration.

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