Lab Final 207L (incomplete)

How do impurities affect melting point?

decrease melting point compared to pure solid

How do you recrystallize something?

dissolve in minimal amount of boiling solvent and leave undisturbed to dry until you see crystals
on ice, then vacuum filter

% recovery

(mass after / initial mass) * 100

How does TLC work?

Separates compounds by its polarity, less polar compounds move slower

How do you determine the best TLC solvent system?

Determine the best concentration of ethyl acetate to get a maximum and minimum rf between 0.2-0.8

acetaminophen

caffeine

aspirin

urea

c

cinnamic acid

benzoic acid

4-tert-buphenol

1,4-dimethoxybenzene