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28 Cards in this Set

  • Front
  • Back
Acetanilide lab-

Which chemicals should one be especially careful with
acetic anhydride
hydrochloric acid
crude acetanilide should have a ______ melting point and a ________ percent yield then the purified acetanilide.
lower melting point
higher percent yield
Which of the following equipment is needed for a vacuum filtration
filter flask
filter adapters
Buchner or Hirsch funnel filter paper
thick walled tubing
If you started with .05moles of aniline and made 6.75g of acetanilide, what is your percent yield?
MW of Acetanilide = 135 g/mole
In today’s laboratory you will be separating an acid and a base. One can calculate
weight percent recovery
a) In this experiment Mixture A contains both benzoic acid and p-nitroaniline. The base is ________________.
When extracting the methylene chloride (dichloromethane) solution with 25ml of 6M HCl, the procedure says to drain the aqueous extract into an Erlenmeyer. The aqueous layer is
hydrochloric acid
When extracting the methylene chloride (dichloromethane) solution with 25ml of 6M HCl, the procedure says to drain the aqueous extract into an Erlenmeyer. Which layer will be on the top?
the aqueous layer
Theorectically, which type of distillation should give better separation of the two compounds
fractional distillation
Which two unknowns will be separated by distillation today
ketone and alkane
In the IR of an alkane, there should be no presence of
A carbonyl absorption around 1710cm-1
In order to identify the unknown compounds in the distillation lab, in addition to IR, we will use
boiling point
The Rf value of a compound is defined as
The distance traveled by the substance/the distance traveled by the solvent front.
In the first part of the chromatography experiment we will be separating the following compounds
When one monitors a reaction by thin-layer chromatography one knows that the reaction is complete when TLC shows
the appearance of a spot for product and the disappearance of a spot for
starting material
Thin Layer Chromatography can be used to
- follow the extent of reaction
- suggest the purity of a compound
What is the primary difference between TLC and column chromatography
The moving phase in column chromatography travels downward, whereas in TLC the solvent ascends the plate
Which two compounds in today’s experiment will be separated from column chromotograhy?
Fluorene and Fluorenone
The adsorbent on the column in the chromotography experiment will be
Fluorene will elute off the column with a
non polar solvent
Another name for t-Pentyl Chloride is
If one starts with .05 moles of t-pentyl alcohol, what is the theoretical yield of t-pentyl chloride. (Note: the molecular weight of t-pentyl chloride is 106 grams/mole)
What absorption will not be present in the IR spectrum of t-pentyl chloride that would be present in the starting material t-pentyl alcohol?
The synthesis of t-pentyl chloride from t-pentyl alcohol is an
SN1 reaction
The Infrared Spectrum of S-(+)-Carvone and R-(-)-Carvone is?
exactly the same
R-(-)-Carvone and S-(+)-Carvone are
- non-superimposable mirror images
- enantiomers
Speific Rotation is defined by the equation
alpha observed/(c)(l)
Which method will differentiate between the two enantiomeric carvones