AcidBaseHandout - Point sep funnel away from self and...

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NH 2 O OH NH 2 O OH
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TLC Ques)on A student developed three normal TLC plate with same samples but diferent developing solvents. A<er the visualiza)on oF samples, he could not remember which TLC plate corresponds to each solvent. Can you guess the correct solvent based on this TLC data?
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Extraction Review • Separation based on relative solubility of compounds • Remember density! Which layer is upper? Lower? • Key for acid/base extraction: Salts are water-soluble!
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Separating Acid Use a base to react with the acid, creating a water soluble salt. organic organic aqueous base NH 2 O OH
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Separating Base Use an acid to react with the amine (base) to form a water- soluble salt. acid NH 2
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How Do We Recover Our Compounds? Use drying agent, then evaporation to recover compounds from ether. NH 3 O O Na
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Separatory Funnel Notes Vent your sep funnel after shaking! – Pressure may build from v_____ s_____ (ether, DCM) or a ___ formed as product of acid base reaction.
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Unformatted text preview: Point sep funnel away from self and others (back of corner of hood). Take off stopper after you place the sep funnel on the ring or clamp. Make sure stopcock is CLOSED before adding anything! Acid-Base Extraction Question At stage II on the flowchart, the species present in the aqueous layer is/are (or is closely related to) A. compound 1 only B. compound 2 only C. compound 3 only D. compounds 1 & 2 E. compounds 2 & 3 Experiment Notes Required: Recrystallize acid Melting point of acid TLC of neutral, acid, and mixture (1 plate!) Extra Credit Recrystallize neutral compound and melting point of neutral compound How To Recrystallize Neutral Compound Use just enough hot ethanol to dissolve compound Add hot water 1 drop at a time until first signs of cloudiness appear Add hot ethanol 1 drop at a time until cloudiness disappears Cool and continue as usual...
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This note was uploaded on 11/23/2010 for the course CHEMISTRY Chem 51 LA taught by Professor Dr.reneelink during the Spring '10 term at UC Irvine.

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AcidBaseHandout - Point sep funnel away from self and...

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