1 suppose a drop of permanganate titrant adheres to

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A Small Scale Approach to Organic Laboratory Techniques
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Chapter T19 / Exercise 5
A Small Scale Approach to Organic Laboratory Techniques
Lampman/Pavia
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1. Suppose a drop of Permanganate titrant adheres to the wall of a dirty buret during the Standardiza- tion. Explain how this error affects the determination of the Permanganate concentration.
2. Normally, when reading the volume of Water in a buret, volumetric flask, pipet or graduated cylinder we read the bottom of the Water’s meniscus. Why do we read the top of the meniscus in this case? Will this affect our results? Explain.
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A Small Scale Approach to Organic Laboratory Techniques
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Chapter T19 / Exercise 5
A Small Scale Approach to Organic Laboratory Techniques
Lampman/Pavia
Expert Verified
reading is simply more efficient. It makes our results more correct since the readings of the buret are generally more accurate. 3. During the titration of the Potassium Ferric Oxalate Trihydrate with Permanganate, only the Oxalate Ion, and not the Ferric Ion (Fe3+), is titrated. Why is the Ferric Ion not also oxidized in this titration?
4. Suppose we have a sample containing Ferric Ion (Fe3+) and we wish to determine the amount of Iron present using a Permanganate titration. How might we treat the sample so as to make this possible?
5. If the titration is carried out too rapidly, a brownish solid will form. What causes this? (Hint: Consider possible intermediate oxidation states of Manganese.)

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