Chm2211 Lab Quiz1

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Author:
bkheath
ID:
106217
Filename:
Chm2211 Lab Quiz1
Updated:
2011-10-03 22:25:22
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Chm2211 Lab Quiz1
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Chm2211 Lab Quiz1
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  1. Theoretical yield=
    mol limiting reagent x molec weight of product
  2. Extraction takes advantage of compounds' differences in ___ or ___
    solubility or chemical reactivity
  3. For liq-liq extraction, the 2 solvents must be ____ (one is usually ___ and the other is ____). The compound to be extracted must also have ____ ____ for the 2 solvents.
    • immiscible (nonpolar organic liquid, polar aqueous solution)
    • different affinities
  4. COOH and phenols are organic molecs which are acidic b/c:
    easily lose a H+ when placed in aqueous base
  5. Substituted amines are basic b/c:
    easily accept a H+ in aqueous acid solution
  6. How can acid-base reactivity allow us to selectively extract organic compounds?
    the organic molecs w/COOH, phenol (alcohol), org amine functional groups are converted to water soluble salts, which can then be extracted from the organic phase into the aqueous phase
  7. Why wash the organic layer with brine? And then why add the anhydrous inorganic salt?
    • To remove the lil bit of water that has been absorbed into the organic solvent (tho they are immiscible w/water).
    • To dry it further by absorbing water that is dissolved in the organic solvent.
  8. How to break up an emulsion
    Make the aqueous layer more polar by adding small amt of brine solution, then gently mix. Or gently swirl the liquid in the funnel
  9. Limiting reagent calcs =
    actual g of reactant x molec weight
  10. Can u separate 2 compounds w/similar pKa?
    No, wouldn't be able to take advantage of differences in acidity

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