• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Objective: 1.To study the preparation of 1-bromobutane from 1-butanol by an SN2 reaction 2.To study the method of purification of an organic compound by simple extraction 3.To study the test of identification of alkyl halide

Extracts from this document...


Title: Preparation of 1-bromobutane from 1-butanol by SN2 reaction Objective: 1. To study the preparation of 1-bromobutane from 1-butanol by an SN2 reaction 2. To study the method of purification of an organic compound by simple extraction 3. To study the test of identification of alkyl halide Chemicals and Apparatus: ~18.0 g 1-butanol, ~20.0 g sodium bromide, 15 ml of concentrated sulfuric acid, anhydrous magnesium sulfate, ~10 ml of 5% aqueous sodium bicarbonate, ~1 ml of sodium iodide - acetone reagent, 1 ml of bromine in chloroform, 1 piece of 100 cm3 round-bottomed flask, 1 piece of 50 cm3 of beaker, 1 piece of 50 cm3 of conical flask, 1 piece of 250 cm3 of separating funnel, 1 piece of 10 cm3 of measuring cylinder, 1 piece of electronic hot plate, oil bath, several pieces of anti-bumping granules, ice, filter paper and filter funnel. Procedures: The experiment was divided into three parts and worked in pairs. A) Preparation of 1-bromobutane from 1-butanol 1. ...read more.


10. After the reflux period, the heat was removed and the mixture was allowed to cool at room temperature. B) Purification of 1-bromobutane by extraction 1. The cool mixture was decanted into a 250-mL separatory funnel. 2. The round-bottomed flask was rinsed with small amount of water and the rinse was put into the separatory funnel. 3. The two layers were allowed to separate and the aqueous later was drained off. 4. The organic later was washed in the separatory funnel successively with 10 mL water, 10 mL of 5 % aqueous sodium bicarbonate and 10 mL of water. 5. The funnel was shaken well in each case. The gas pressure was released regularly during the shaking. 6. The aqueous layer was discarded down the drain. 7. The organic later was collected into a 50 mL conical flask. 8. To the organic later, about 1 gram of anhydrous magnesium sulphate was added. The conical flask was swirled thoroughly. 9. The organic layer was filtered using the filter paper and funnel to remove the used magnesium sulphate. ...read more.


The extractions further isolated the product, the substance which has higher density was always the bottom layer and the lighter was on top. It turned out that the organic layer was always on the bottom of each extraction. Anhydrous magnesium sulphate was a very good drying solution. This allowed it to soak up the remaining water to a great extent. The amount collected was 9.207 gram of 1-bromobutane. The percent yield of 1-bromobutane obtained was 31%. The sodium iodide/acetone classification tests proved positive. This reaction must be a SN2 reaction as the product was almost entirely 1-bromobutane, if by an SN1 mechanism, the product should consist of mostly 2-bromobutane derived from the sec-butyl cation formed via a 1,2-hydride shift. Such an interpretation of the product distribution must be made with caution. The presence of small amounts of 2-bromobutane in the reaction product did not necessarily mean that it was produced from 1-butanol via an SN1 mechanism because an alternative sequence of an E2 elimination of the protonated 1-butanol to give 1-butene followed by HBr addition to the 1-butene would also produce 2-bromobutane. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Chemistry essays

  1. Investigate the rate of reaction of luminol in various factors. The objective was to ...

    lower than the temperature to be investigated, then it is then heated to the desired temperature. This can ensure the temperature did not rise higher than the required temperature. 0.15M H2O2 was used in Investigation C, the concentration is suitable because it is not too oxidising, that the time of chemiluminescence is longer than that of 0.3M H2O2.

  2. The preparation of Benzoic acid from benzamide

    What are the reasons for this ? What improvements could be made ? The impurities in the crystal. Recrystallization can improve the purity of the product.

  1. The Extraction of Aluminium.

    With adding molton cryolite to the molton aluminium alone it effectively lowers the temperature needed extract from 2000�C to 950�C, that is more than a 50% decrease in the required temperature 2.

  2. A study of trends in period 3

    A violent reaction take place, fumes of hydrogen chloride is produced pH of solution in water 7 6 3 3 1 Structure of chloride (simple molecular, giant molecular, giant ionic) Giant ionic Giant ionic Simple molecular Simple molecular Simple molecular Data Table 1 Analysis: -None of the oxides formed acidic solutions with water.

  1. Effect of Current on The Quantity of Products in Copper Purification Through Electrolysis

    Variable d�pendante Ma variable d�pendante pour ce laboratoire est la quantit� de produits suite � la purification du cuivre avec une pile �lectrolytique, soit la quantit� de cuivre transf�r�e entre �lectrodes. Elle sera mesur�e en grammes � l'aide d'une balance une fois qu'elle sera filtr�e et s�ch�e.

  2. Testing for halide ions. The objective of the experiment was: ...

    * Steps 1 and 2 were again repeated for one solution and then concentrated ammonia was added into it.

  1. Objective: 1)To practice the procedure for preparing a standard solution 2)To perform ...

    1(trial) 2 3 4 Final burette reading (cm3) 23.00 23.30 23.10 23.15 Initial burette reading (cm3) 0.00 0.00 0.00 0.00 Volume of titrant used (cm3) 23.00 23.30 23.10 23.15 Average volume: 23.18 cm3 Calculation: Na2CO3 (s) + 2HCl --> 2NaCl(s) + H2O(l) + CO2(g) Number of mole of Na2CO3(aq) = 1.302g / 105.8089gmol-1 = 0.0123 ?

  2. Period 3 Chlorides. Aim: To study the chlorides of period 3 elements and ...

    Then I took the first test tube, measured the temperature of the distilled water in it, and took half a spatula tip of NaCl and added it to the test tube. 4) After 1 minute, I noted the temperature of the solution, whether the chloride dissolved and any other observation, e.g.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work