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Briefly explain why should the flask be stoppered after the addition of KI in the standardization of sodium thiosulfate VS.
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- 1. What effect will the following factors have on a chromatographic separation? (a) Too strong an adsorbent (b) Collection of large elution fractionsWhy is there a change to the way the dye molecules partition between two solvents when ethanol is added?Why is it not necessary to dry the Erlenmeyer flask between each trial?
- Acetone and isopropyl alcohol are generally not suitable for use in extraction, but are frequently used as recrystallization solvents. ExplainUsing any chemical concept (like concepts in liquid liquid extraction, concepts in recrystlliazation, etc) in an expirment of extraction of Caffein, make a connection to ONE of the following: 1) an event in the news, 2) your career plans, 3) a hobby of yours, 4) another course you are taking, or 5) your personal life.Your writing should find at least one way, if not more, in which the chemical concept you have chosen to talk about is demonstrated in the connection.What is the reason that an internal standardization technique, rather than a regular external standardization or standard addition technique, is required for GC analysis of caffeine?
- (4) Below are depictions of a student's TLC plates in which fractions 1 - 10 from their column are spotted. Lane 1 2 3 4 5 67 8 9 10 (a) Which fractions contain pure fluorenone? Which contain pure ferrocene? (b) Which lanes, if any, represent mixed fractions? (c) Would the student incorporate lanes 6 and 7 into an Erlenmeyer flask of a combined fraction? Explain with 10 words or less.(7) Answer the following questions with the choices (a-d): (a) "Affinity" (b)"Adsorption" (c)"Size-exclusion" (d) "Partition"Why is the Refractive Index of hexane closer to the refractive index of heptane in both simple and fractional distillation?
- 1. Cite one factor that affects percent yield during recrystalization. 2. Discuss the importance of solvent-solvent partition in separating mixtures.Based on the resulting chromatograms after visualization with iodine vapor, which between the solvent systems WHITE and MIX resulted in a more effective separation of the pigments of the indigo extract? Explain your answer in terms of the solvent that did not effectively separate the components of the root extract.Assuming that either solvent is otherwise acceptable in a given instance, what advantages does ethanol have over 1-octanol as a crystallization solvent? Hexane over pentane? Water over methanol?