DATE TA: NAME Prelab Experiment 9 E2 Elimination 1. Calculate the molar ratio of
ID: 1061272 • Letter: D
Question
DATE TA: NAME Prelab Experiment 9 E2 Elimination 1. Calculate the molar ratio of base to 2-bromo-2-methylbutane to be used in the elimination experiment (s) you perform and specify which is"limiting reagent. Show your calculations. (2 pt) 2. Why is the vacuum adapter ofthe apparatus to be fitted with a drying tube throughout the course of the reaction and the distillation? (1 pt) 3. Why is the receiving flask to be cooled in an ice-water bath throughout the reaction and distillation? (1 pt) 4. Demonstrate that the amount of 4 M potassium hydroxide solution used for the elimination provides an excess of base relative to the alkyl bromide. (2 pt)Explanation / Answer
1.
In elimination reaction of 2-bromo-2-methylbutane with a base, theoritically we need 1:1 ratio of 2-bromo-2-methylbutane : base. But practically, we always take base in little excess. In elimination always the substrate (2-bromo-2-methylbutane) is taken as limiting reagent.
2.
Reactions which are being carried out on heating or which evolve gases, must never be sealed. Because an overpressure may shatter the vessel. Drying tubes are usually fitted on top of the reflux condenser, allowing the pressure to be relieved while excluding atmospheric moisture. During distillation, the liquid goes to vapour (that is gas formation).
3.
The ice-water bath is an option designed to cool the distillate to speed and improve condensation, which happens in the receiver flask.
4.
This question has no data to calculate. You didn't provide the mass of alkyl halide you used in the reaction.
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