4. What toxic fumes evolve in fires involving 1-bromobutane? 5. In the purification process, the organic...
4. What toxic fumes evolve in fires involving 1-bromobutane?
5. In the purification process, the organic layer was washed with cold 2 M NaOH solution and then with saturated NaCl solution. What is the purpose of these washes?
6. Why is the 1-bromobutane treated with anhydrous sodium sulfate?
7. Why does the final step of purification involve a distillation? Suggest what is removed by this distillation.
Homework Answers
Answer to 4. When a fire containing 1-bromobutane takes place, the fumes of a toxic gas HBr (hydrogen bromide) evolves.
Answer to 5. The synthesis of 1-bromobutane is carried out by using 1-butanol and sodium bromide in presence of sulphuric acid.
After reaction completion, as shown in above first equation, there is a few amount of HBr, sodium hydrogensulphate (NaHSO4), H2SO4, NaBr remains present in the reaction vessel along with the desired 1-bromobutane. Out of all these organic layer is washed with 2M NaOH to remove traces of H2SO4, Thus,
H2SO4 + NaOH gives Na2SO4 (sodium sulphate) and water which are soluble in water and thus remaining H2SO4 is removed. After treating with 2 M NaOH, the organic layer is washed with brine (aqueous saturated sodium chloride solution) to remove the traces of desired product in aqueous layer. Due to saturation of water by NaCl, 1-bromobutane gets out of it and gets dissolved in organic layer.
Answer to 6: 1-butanol is treated with Na2SO4 (sodium sulphate) to remove any water molecules from the organic layer.
Answer to 7: During this experiment, a proper solvent (here it may be p-xylene or toluene) is used to extract 1-butanol. To remove this solvent in a final step, distillation is carried out.
Add Answer to:
4. What toxic fumes evolve in fires involving 1-bromobutane?
5. In the purification process, the organic...
You don’t have to tell me purpose. just where in procedure for each technique. Section/Instructor SN2...
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don’t have to tell me purpose. just where in procedure for each
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Section/Instructor SN2 Pre-lab (20 points) Answer on a separate piece of paper 1. (6 pts.) What is the purpose of the following experimental techniques and where in the procedure is each used? a. Heating under reflux b. Simple distillation c. Water wash d. Addition of COLD NAOH e. Saturated NaCl solution f. Addition of anhydrous sodium sulfate SN2 Reaction Procedure Set-Up: 100 mL RBF: 11.1 g...
Synthesis of 1-Bromobutane: An SN2 Reaction Pre-Laboratory Exercises PRE-LABORATORY EXERCISES NAME: Cynthesis of 1-Bromobutane: An SN...
Synthesis of 1-Bromobutane: An SN2 Reaction Pre-Laboratory
Exercises
PRE-LABORATORY EXERCISES NAME: Cynthesis of 1-Bromobutane: An SN 2 Reaction Butylbromide was prepared by refluxing in a 100-ml round bottomed flask a solution containing 13:35 Br 15 ml of water, 10 mL of n-butyl alcohol. 15 ml of concentrated H.SO. and a few boiling stories, 1. 2. R." d 1.275 laborales Nel CH3CH2CH2CH2OH + NaBr H2SO4 Superletalyst CHCH2CH2CHBr + NaHSO + HO (eq. 16) 1-butanol bp 118 C 1-bromobutane d 0.810 bp...
This procedure was conducted for diethyl n-butylmalonate. The question is: What is the purpose of the...
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Chapter 42 Malonic Ester of a Barbiturate 541 Into a 5-mL long-necked, round-bottomed flask, weigh 40 mg of tricaprylmethylammonium chloride, 400 mg of diethyl malonate, 350 mg of 1-bromobutane, and 415 mg of anhydrous potassium carbonate. Attach the empty distillation column as an air condenser and reflux the mixture for 1.5 hours (Fig. 42.1)....
1. what is the purpose of the following in this experiment: a. concentrated (and not dilute)...
1. what is the purpose of the following in this
experiment:
a. concentrated (and not dilute) hydrochloric acid
b. collecting the distillate in ice
c. sodium bicarbonate extraction
d. water extraction
e. anhydrous sodium or magnesium sulfate
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Synthesis of Methylbutenes catalyzed Dehydration of 2 Meth H.SO buano detin vee distinct steps in most organic preparat the reaction itself solation of the final product final product purification ances, as in the dehydration of an alcohol, it is necessary to be the first two stesso oduct can be removed from the reaction mixture is formed. This was to drive the brium to toward...
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s, until the I hexano 1 clean disti CYCLOHEXENE from CYCLOHEXANOL be dehydrated with solfuric acid to yield cyclohexene and waterf Add a 0°C (record ct and cal H,SO + H20 ainer. s in purification of any crude product are (a) the preliminary separation of the product from the reaction mixture by distillation...
10. Using your answer to 6e: 6e: What percent of the mixture obtained in reaction 1...
10. Using your answer to 6e: 6e: What percent of the
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a) How many millimoles of the para product were
present in the isomeric mixture added in the first step of reaction
2? Please show your work.
b) In order to selectively acetylate the para isomer, equimolar
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Using the millimoles you obtained as your answer to...
You
don’t have to tell me purpose. just where in procedure for each
technique.
Section/Instructor SN2 Pre-lab (20 points) Answer on a separate piece of paper 1. (6 pts.) What is the purpose of the following experimental techniques and where in the procedure is each used? a. Heating under reflux b. Simple distillation c. Water wash d. Addition of COLD NAOH e. Saturated NaCl solution f. Addition of anhydrous sodium sulfate SN2 Reaction Procedure Set-Up: 100 mL RBF: 11.1 g...
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This procedure was conducted for diethyl n-butylmalonate. The
question is: What is the purpose of the tricaprylmethylammonium
chloride and why is it used in a nomstoichiometric?
Chapter 42 Malonic Ester of a Barbiturate 541 Into a 5-mL long-necked, round-bottomed flask, weigh 40 mg of tricaprylmethylammonium chloride, 400 mg of diethyl malonate, 350 mg of 1-bromobutane, and 415 mg of anhydrous potassium carbonate. Attach the empty distillation column as an air condenser and reflux the mixture for 1.5 hours (Fig. 42.1)....
1. what is the purpose of the following in this
experiment:
a. concentrated (and not dilute) hydrochloric acid
b. collecting the distillate in ice
c. sodium bicarbonate extraction
d. water extraction
e. anhydrous sodium or magnesium sulfate
chapter Alkyl Halides and Nucleophilic Aliphatic Substitution 13.1 SYNTHESIS OF BUTYL CHLORIDE Alkyl halides can be prepared by reacting an alcohol with concentrated hydrogen halides: R-OH + H-X- R-OH, R-X. HO where X-CI, Br, I. The reaction of hydrochloric acid with 2 and...
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Need help making a separation scheme for the synthesis of
methylbutene based on the experiment procedure
Synthesis of Methylbutenes catalyzed Dehydration of 2 Meth H.SO buano detin vee distinct steps in most organic preparat the reaction itself solation of the final product final product purification ances, as in the dehydration of an alcohol, it is necessary to be the first two stesso oduct can be removed from the reaction mixture is formed. This was to drive the brium to toward...
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(see above). I need help answering questions 2, 3, and 4 completely
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s, until the I hexano 1 clean disti CYCLOHEXENE from CYCLOHEXANOL be dehydrated with solfuric acid to yield cyclohexene and waterf Add a 0°C (record ct and cal H,SO + H20 ainer. s in purification of any crude product are (a) the preliminary separation of the product from the reaction mixture by distillation...
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