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ochem lab review.docx

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Department
Chemistry
Course
CHEM261
Professor
Hayley Wan
Semester
Winter

Description
1SolventMiscibilityandRecrystallizationMiscibilitySolubilityoAbilityoftwoliquidstomixinallproportionstoformhomogenoussolutionoLikedissolveslikeoHigherdensityislowerlayeroOrganiccompoundscanbeextractedfromwaterwithhydrophobicsolventsoIoniccompoundsandhydrophilicliquidscanbeseparatedfromhydrophobicsolventsbyextractionwithwateroOrganiccompoundscanbemadelesssolubleinwaterbytheadditionofinorganicsaltsRecrystallizationoCompoundswhicharelesssolublewillbethefirsttocrystallizeoSolutemustbeinsolubleinroomtemperaturesolventbutsolubleinhotboilingsolventoSolventwithslightlydifferentpolaritythansoluteworksbestoIfasubstancewilldissolveinasolventbutwillnotcrystalizeasecondsolventmisciblewiththefirstandinwhichtheoriginalsubstanceisinsolublemaybeaddedIdealSolventsfor2SolventRecrystallization1DissolvecompoundinminimumvolumeofhotsolventA2AddhotsolventBoCompoundmustdissolveinsolventAatanytemperatureoCompoundmustnotdissolveinsolventBatanytemperatureoCoolingcausescrystalstoprecipitateoSolventsAandBmustbemiscibleIdealSolventsfor1SolventRecrystallizationoSolventshouldntreactchemicallywithcompoundoSolventshouldhavebpfrom50120CeasyevaporationoSolventshoulddissolvecompoundwhenhotbutnotverymuchwhencoldoImpuritiesmustbeinsolubleinhotsolvent2ChromatographyandMeltingPointLiquidSolidChromatographyoTLCandcolumnoStationaryphasesolidsilicaaluminaadsorbentoMobilephaseliquideluentoMorepolarstrongerinteractionwithadsorbentoAdsorbentusuallypolaroEluentmostlynonpolarTLCoPuresamplesinglespotimpuresamplemultiplespotsoCompoundsshouldbedissolvedinleastpolarsolventinwhichtheyarereadilysolubleDCMoDevelopingchamberoFilterpaperwithlidtosaturatethechamberwitheluentoThereiscompetitionbetweeneluenttodissolvesubstanceandadsorbenttoadsorbthesubstanceoPolarcompoundsadheretosilicaanddonttravelfaroNonpolarcompoundsdissolveeasilyandtravelfasterandfurtheroUVvisualizationusedforcompoundsthathaveconjugationoStainsareusedforcompoundsthatarenotconjugatedvanillinPMAiodinevaporzincsulfideoConjugatedhavingelectronsinporbitalsorparallelpiorbitalsadjacenttoeachotherdelocalizingelectronsStrengthofintermolecularinteractionsonsilica
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