7 lab questions (lab3)
13. The vapor pressures of 1 ,2-diphenylethane, p-dichlorobenzene, and 1,3,5-
trichlorobenzene are 0.06, 11.2, and 1.4 torr, respectively, at their melting
point (52-54 degrees C). Which compound is likely to be sublimed most
rapidly at a reduced pressure of 15 torr and a temperature of 40 degrees
C?
14. To color spots on TLC plates for easier visualization after elution with
solvent, the plates can be "developed" in a sealed chamber containing
solid iodine. Explain how the solid-vapor equilibrium operates in this
instance.
15. Caffeine is soluble in ethyl acetate. Do you think that the purity of your
product could be checked by TLC using ethyl acetate as an elution
solvent? Explain.
16. List several advantages and disadvantages of steam distillation as a
method of purification.
17. Explain why the distillate collected from the steam distillation of cinnamon
is cloudy.
18. Calculate the weight of water required to steam distill 500 mg of
bromobenzene at 95 degrees C. The vapor pressure of water at this
temperature is 640 torr; bromobenzene, 120 torr.
19. Steam distillation may be used to separate a mixture of p-nitrophenoln and
o-nitrophenol. The ortho isomer distills at 93 degrees C; the para isomer
does not. Explain.
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