chem lab quiz 5

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8 Terms

1
What are two properties of a good extraction solvent?

1. Should readily dissolve the substance to be extracted at room temperature.

2. Should have a low boiling point so that it can be removed readily.

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2
What physical property determines if a layer is on the top or bottom in an extraction experiment?
The least dense solvent will be the top layer.
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3
What is the major advantage of methyl tert-butyl ether (MTBE) over diethyl ether as an extraction solvent?
It does not easily form peroxides, allowing for longer storage without as high of a fire threat.
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4
List two steps in the work-up of a liquid/liquid extraction.

1. Mixing the layers

2. Separating the layers

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5
Why do most combinations of extraction solvents include water?
Most organic compounds are immiscible in water, allowing separation from inorganic compounds.
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6
List the three compounds separated in the Acid/Base liquid/liquid extraction.
Phenol, naphthalene, and aniline.
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7
Which compound separated is the most acidic?
Phenol is the most acidic.
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8
Which compound separated is not acidic?
Naphthalene is the least acidic.
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