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14 Cards in this Set
- Front
- Back
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definition: a mixture of compounds where their IMAF interactions actually cause a mixture to appear to melt in a very narrow range
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eutectic points
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what corrects for when a thermometer does not indicate the exact literature temp
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calibration
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in a good recrystallizaiton solvent does what happens when the solvent is hot
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should dissolve solid
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when the solvent is cold
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solid is insol
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what is good recrystallization based on
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polarity of the compound
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what is column chromatography good for
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separates large amounts of material
produces good purity |
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how does column chromatography work
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make a column
dissolve the compound in small amounts of eluent mixture first run nonpolar eluent after it is out run more polar eluent recover crystals from eluent |
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what is the formula for Rf
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spot/solvent
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when should vacuum distillation be used
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risk of decompositio with heat
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when should fraction distillation be used
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bp is within 25
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when should simple distillation be used
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bp is separated by more than 25 degrees celcius
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what is an azeotrope
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is a mixture of two or more pure compounds (chemicals) in such a ratio that its composition cannot be changed by simple distillation.[1] This is because when an azeotrope is boiled, the resulting vapor has the same ratio of constituents as the original mixture of liquids.
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how does extraction work
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by turning a compound into an ion that is soluble in an aqueous layer
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henderson hasselbach equation
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ph = pka + log[A-]/[HA]
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