The questions are from chem lab on the top and the bottom questions are chem lec

Question

The questions are from chem lab on the top and the bottom questions are chem lecture (two different sections) Thanks for the help!

Other than relative solubilities, what are two additional factors that may be worth taking into consideration when choosing an organic solvent for use in a liquid-liquid extraction against water. Percent recovery and percent yield are occasionally used as if they are interchangeable terms. They do, however, have different meanings. Why is it correct to use percent recovery here? Would the apparent percent recovery be higher, lower, or unchanged if a student did the following: Explain your answer. a. Used room temperature water to brew the tea? b. Did not add calcium chloride when directed? 1. 2. 3. Locata each chirality cedex andl ass Cenfiquratin each eme n the Ho Assign the entire IVAC name for the follow compoundl:

Explanation / Answer

1)

a)

Partition coefficient of solute between organic solvent and water. If the partition coefficient is larger then the solute can be extracted easily from water by organic solvent.

b)

Organic Solvent should be inert towards solute. That means solvent should not react with solute during the extraction. If the solute reacts chemically with the solute then it is impossible to separate the solute from organic layer after extraction.

c)

Volume of extraction solvent can also play major role. If we have only 200 mL of organic solvent to extract the solute from water, then it is better to use two or more times than single use. That means if 200 mL at a time we can extract less amont than the amount extracted by using solvent two or more times (100mL + 100mL or 50 ml four times etc)

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