Question

Procedure Reaction: Add about 15 mL (measured precisely) of t-amyl alcohol to a 50 mL round bottom flask (the flask will become your stillpot). Cool the pot in an ice-water bath and slowly add, with swirling, about 5 mL of 9 M sulfuric acid. Add two boiling chips then clamp the flask to your ring stand. Do not leave the flask someplace it can be knocked over.

Set up a fractional distillation with a foil wrapped Vigreux column. Use a 25 mL round bottom flask as the receiver and cool the receiver in an ice bath so that volatile products do not evaporate. Have your instructor check your setup, then heat with a heating mantle at 50% power. When the pot begins to boil, start checking the temperature. Stop distilling when 1/2 to 2/3 of the pot contents are gone, OR, when the temperature abruptly begins to rise after a period of collection.

Isolation and Purification: The 25 mL receiving flask will now become the still pot for a simple distillation to purify the product. Detach the old receiver/new still pot and add about 1 gram of anhydrous Na2SO4 (to remove water impurities) and two pellets of sodium hydroxide (to remove acid impurities). Use the cleaned and dried 50 mL round bottom flask as your new receiver and pre-weigh it (on a cork ring) before it is attached. Remove any water droplets from the condenser, vacuum adapter and still head by rinsing with acetone before you set up the simple distillation. Cool the receiver as before. Distill your product(s) until the pot is almost dry. Record the boiling point range of your product(s) and their weight. Transfer the alkenes to a pre-weighed vial and record the mass of the product. Cap and seal the vial with paraffin until you are ready to take the GC. Store the sample in the refrigerator if you are taking the GC on a different lab day. Characterization: Chemicals: t-amyl alcohol, 9M sulfuric acid, anhydrous sodium sulfate, sodium hydroxide (s).

Which of the following is a catalyst in the dehydration reaction?

a.NaOH

b. Na2SO4

c.t-amyl alcohol

d.H2SO4

Which would you predict to be the major product of the elimination?

a.2-methyl-2-butene

b.2-methyl-1-propene

c.1-methyl-1-butene

d.2-methyl-1-butene

What is the molar mass of the product alkenes in g/mol?

Answer 1

Solution catalyet d. 04 The used in the dehydratioy reackioy is Tepns wnchanged oreatioy anol chemcel cataly6t compasition at the end A mass Hence, optio dis correct. Eliminetion reation uing t-aylatohiol 2504 metye 2-tutene 2- hinyor prded) Teatica Erelimination Herce the mero protet eliniction 2-metyl-2-butene Henceoption is corvect elkere 2-metge&buteae 70.13 moar MasS