CH 220 Lab Report 1: Fractional Distillation of a Binary Mixture and Gas Chromatography This experiment was done in order to understand both fractional distillations and gas chromatography. In addition, this experiment was done to separate and identify two liquids that made up an unknown mixture. Gas chromatography was used to figure out the ratio of these two liquids. In this experiment, distillations were done. This is a technique that utilizes the differing boiling points of two or more compounds in a mixture in order to separate the compounds from the mixture. The way fractional distillation works is that the initial mixture is boiled up to the point of the lower boiling point compound; this compound then evaporates. This compound is then …show more content…
The volume and the boiling point of each collected sample was recorded in a table (for Fractions A, B, and C). The data in the table was converted into a graph (both of which are attached to the back of the report). There is, like in all experiments, an ideal set of data. In this experiment, if the distillation for the unknown mixture (which has two compounds) was done properly, the temperature vs. volume graph should show two plateaus for temperature. (See hand drawn graph attached on back). We look at the plateau temperatures because they are essential to find out what the unknown compounds are. This is because the plateau temperatures show us the boiling point ranges for the unknown compounds. In addition, as shown in the table and calculations attached to back, the volume of the collected sample can be utilized to figure out a ratio of the compounds. But, of course, since ideal and pure samples were not collected, the ratios that are calculated are just estimates. There is one plateau for the boiling point of both lower and higher boiling point compounds. The lower boiling point plateau comes first. The transition phase that occurs between the first and second plateaus was collected. This transition phase represented the mixture of the two compounds in the experiment. If the experiment yielded ideal results, sample A would show to be consisted of primarily the lower boiling point compound. This would be the case up to the point when the temperature is raised to match the boiling point of the higher boiling point compound. The compound is sample C. During the experiment this sample was gathered in a falcon tube. But there is some error in my results. Some of the reasons why there was error in the experiment are stated. I boiled Fraction A for too long, the boiling rate was too high, or a combination of these errors occurred. If the boiling rate is too fast, the side arm will heat up as the
14 mL of 9 M H2SO4 was added to the separatory funnel and the mixture was shaken. The layers were given a small amount of time to separate. The remaining n-butyl alcohol was extracted by the H2SO4 solution therefore, there was only one organic top layer. The lower aqueous layer was drained and discarded. 14 mL of H2O was added to the separatory funnel. A stopper was placed on the separatory funnel and it was shaken while being vented occasionally. The layers separated and the lower layer which contained the n-butyl bromide was drained into a smaller beaker. The aqueous layer was then discarded after ensuring that the correct layer had been saved by completing the "water drop test" (adding a drop of water to the drained liquid and if the water dissolves, it confirms that it is an aqueous layer). The alkyl halide was then returned to the separatory funnel. 14 mL of saturated aqeous sodium bicarbonate was added a little at a time while the separatory funnel was being swirled. A stopper was placed on the funnel and it was shaken for 1 minute while being vented frequently to relieve any pressure that was being produced. The lower alkyl halide layer was drained into a dry Erlenmeyer flask and 1.0 g of anhydrous calcium chloride was added to dry the solution. A stopper was placed on the Erlenmeyer flask and the contents were swirled until the liquid was clear. For the distillation
Abstract The purpose of this experiment is to separate a mixture of hexane and toluene by collecting fractions through simple and fractional distillation. Because hexane’s boiling point is about 68°C and the boiling point of toluene is 111°C, the two compounds distill at different times. Pure products will be analyzed with gas chromatography to determine the success of the distillation. For easy separations, a simple distillation apparatus probably will suffice, but for more difficult separations, a fractional distillation apparatus will be used in this lab. The goal is to show that fractional distillation separates the two compounds more completely because less material is lost. In conclusion the fractional distillation indeed separates the two compound
This experiment studied the fractional distillation of a butyl acetate and ethyl acetate mixture and analyzed the fractions obtained at different temperature levels. Specifically, this experiment sought to analyze the retention times and peak areas of ethyl and butyl acetate in each fraction and compare these
Me and my lab partner, obtained a mixture of a un known proportion from the instructor and then flow the guide line in our lab manual to separate the mixture by applying the separation method motioned in our lab manual pages 33-40 . In this experiment, the separation methods were decantation,
Whereas for simple distillation, the compounds need to be around 80C apart in order for proper separation to occur. Thus, cyclohexane and toluene were not able to be properly separated since the boiling point for cyclohexane was 80.74C while the boiling point of toluene was 110.6C—there two boiling points are fairly close to one another. Thus, the mole fraction for cyclohexane and toluene were fairly low when compared to cyclohexane and
The objective of this extraction experiment was to achieve a comprehensive understanding, as well as master the practice, of the technique of separating various individual components of a compound.
Method: Distillation is based on the fact that the matter can exist in three phases - - solid, liquid and gas. As the temperature of a pure substance is increased, it passes through these phases, making a transition at a specific temperature from solid to liquid (melting point--mp) and then at a higher temperature from liquid to gas (boiling point--bp). Distillation involves evaporating a liquid into a gas phase, then condensing the gas back into a liquid and collecting the liquid in a clean receiver. Substances that have a higher boiling point than the desired material will not distill at the
a. For the redistillation of Fraction 1, predict how the gas chromatogram for the initial fraction would have differed from the gas chromatogram of Fraction 1 from Distillation 1.
Answer: Distillation is a method for separating a liquid from a solid or from another liquid in which the liquid is boiled off and then recondensed (Yee, n.d., Distilliation). It works because the substance you are looking to distill is boiled off recondensed and separated. It can be used to purify liquids from solids or from other liquids (Yee, n.d., Distillation).
The purpose of this experiment was to perform a simple distillation as well as a fractional distillation and to determine the composition of an unknown solution using fractional distillation.
Corresponding to the previous experiment, this week’s experiment measures the participants’ ability to conduct basic, fundamental laboratory procedures. These procedures revolve around scientific measurements of volume, mass, and density. Unlike last week’s activity, this week’s experiment had a few modifications. In addition to distilled water, saltwater and an unknown substance were added. There was a total of five substances to choose from; Hexane, Methanol, Ethyl acetate, Ethylene glycol, and Dichloromethane. Part C, the unknown liquid number was four, which the average density was 0.789 gmL-1, and from looking at the chart the unknown identity was methanol. Part A, the temperature of the water was 20 oC, which was in front of the class,
With the purpose of the experiment being to identify the 30 mL of unknown liquid, the theoretical basis of simple and fractional distillation must be deconstructed and applied to the data obtained describing the liquid in question.
Distillation is a method of separating two volatile chemicals on the basis of their differing boiling points. During this lab, students were given 30 mL of an unknown solution containing two colorless chemicals. Because the chemicals may have had a relatively close boiling point, we had to employ a fractional distillation over a simple distillation. By adding a fractionating column between the boiling flask and the condenser, we were able to separate the liquids more efficiently due to the fact that more volatile liquids tend to push towards the top of the fractionating column, thereby leaving the liquid with the lower boiling point towards the bottom. After obtaining the distillates, we utilized a gas chromatograph in order to analyze the volatile substances in the gas phase and determine their composition percentage of the initial solution. Overall, through this lab we were able to enhance our knowledge on the practical utilization of chemical theories, and thus also demonstrated technical fluency involving the equipment.
The purpose of this experiment was to separate a two component mixture using fractional distillation. Distillation is a process of vaporization than condensation of a substance, used primarily to separate substances from a mixture when there are different boiling points. Fractional distillation is when the mixture has multiple substances with similar boiling points, and a fractional column is used to create multiple vaporization/condensation cycles. Fractional distillation is important when two or more substances need to be separated, but they have similar boiling points.
The purpose of distillation is to purify a liquid. Distillations are use to purify contaminates out of water to obtain clean pure water, as well as, to separate mixtures of liquids into their individual components; e.g. methanol and water.