Paraphrase a reports and solve past exams papers - Coursework Example

Download file to see previous pages The funnel was shaken gently until no effervescence was observed. The top organic layer was washed with water followed by brine in the funnel. Both brine and water ought to be 40 ml. The top organic layer was then transferred into a conical flask before adding anhydrous magnesium sulphate. The mixture was swirled and filtrated in a round bottomed flask. The final product was then distilled in a pre-weighed flask that is ice-cold. The weight and melting point was then measured and recorded. In addition the sample of the IR spectra was carried out. Results: Boiling point: 50°C-52°C Volume: Number of moles: 0.5 mol R.M.M: 74 g/Mol Density: 0.775 g/Mol Mass: 74 0. 5=37 g Volume: Mass/density = 47. 74 ml HCl: Concentration 12 M Number of moles: 1.5 mol Volume=Number of mole / concentration . = = 0.125 L =125Ml. The weight of flask=74. 64 g The weight of flask + sample=92. 36 g Sample’s weight=92. 36-74.64= 17.72 g Theoretical yield = 0.5 x 92.567 =46. 28 g Percentage yield: 17.72 x100/46.28 =38. 3 % Discussion: At room temperature 2-Chloro-2-methylpropane was a colorless liquid organic compound. 2-Chloro-2-methylpropane was slightly soluble and spontaneously solvolysed when dissolved in water. 2-Chloro-2-methylpropane was volatile and highly flammable. ...
For stability. The bondage existing between oxygen and carbon broke hydrolytically. The breakage formed carbocation and was used as electrophille: species’ lacking electrons. Absence of electrons made chloride ions to attack carbocation hence molecule stability. Carbocation assumed role of Lewis acid that welcomed electron from Cl- forming t-butyl chloride. It was then synthesized through SN1. http://1chemistry.blogspot.co.uk/2011/06/synthesis-of-tert-butyl-chloride.html The excess HCL was neutralized by sodium bicarbonate which gave misleading results. The IR spectra are illustrated below: 2: Hydrobromination of trans-stilbene practical. Aim: When the electrophilic species are added to an alkene, the procedure were allowed prepare various functional group. The below reaction, N-bromosuccinimide acted as an electrophilic species which facilitated the addition of HOBr to the double bond. Method: A mixture of 60 ml of dimethylsulfoxide, 1 cm3, and 56 mmol of water, and 3.6 g, 20 mmol of trans-stilbene was transferred to a flask that is round bottomed (100ml). The solution then stirred hard at room temperature. For over ten minutes, 7.1 g with 40 mmol of N-bromosuccinimide was added portion by portion. The solution was left for twenty minutes to mix accordingly. The reaction was transferred to a separating funnel. The separating funnel (200ml) had iced water. Using 4 x 40 ml of diethyl ether after the ice is completely melted, the solution was extracted. Subsequently, the extract fron ethereal was drained with 50 ml of water and brine. The extract was thereafter dried by using MgSO4. On the bath the rotary evaporator concentrated the solutions. On the surface of the solution, white crystals were formed. Further ...Download file to see next pagesRead More