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Distillation Lab Report Experiment Description & Procedure
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Title : Distillation of Methylene Chloride and Toluene by Tarika Arjune Experiment performed: September 23rd, 2021 Report Due: October 14th, 2021 Abstract : We performed a distillation on a mixture of Methylene Chloride and Toluene in order to separate and purify the two liquids. We separated the liquids by using their boiling points where Methylene Chloride has a boiling point of 39.6 degrees Celsius while Toluene has a boiling point of 111 degrees Celsius. The solution was boiled until the Methylene Chloride passed its boiling point and vaporized then the vapor cooled and condensed into droplets which separated the two liquids thus purifying them. At the end of the experiment, we were able to collect 20 mL of distillate and successfully purify the two liquids by using their boiling points. Objective: The purpose of this lab was to observe the separation of two liquids by boiling, vaporizing, and condensing to purify a mixture. Introduction: Distillation is a common method used for purifying liquids by using their boiling points. Simple distillation is used to purify a liquid mixture by separating one liquid from another liquid that has a different boiling point. Simple distillation involves the boiling of the mixture until it turns into vapors that travel to be cooled and condensed into droplets which are collected into a collection flask. A pure liquid has one constant boiling point so a change in boiling point
indicates impurity. However, this is not always the case as if there are two liquids with similar structures then the boiling point could be the same and the boiling point of the mixture would be close to that temperature. The closer the boiling points of the components of the mixtures then the more difficult it is to separate them. Toluene and Methylene Chloride have boiling points that are far apart and so that makes it easier to separate. Toluene has a boiling point of 111 degrees Celsius and Methylene Chloride has a boiling point of 36.9 degrees Celsius which means that the Methylene Chloride will boil and vaporizes before Toluene reaches its boiling point. The Methylene Chloride will separate from the Toluene and be condensed into droplets that are collected in a graduated cylinder. Distillation of the Methylene Chloride and Toluene separates the two liquids based on their boiling point by vaporizing the Methylene Chloride which has the lower boiling point then condensing it and this allows the liquids to be purified. Reactions/Schemes/Mechanisms: No Reactions- N/A *The mixture boils until it vaporizes and then condenses back into liquid drops. Materials: A Simple Distillation Apparatus: use to separate the liquids based on boiling, vaporization and condensation 60 mL of 50:50 mixture Toluene: Methylene Chloride: mixture that is used to separate based on boiling point 100 mL graduated cylinder: used to collect the distillate 100 mL round-bottom flask: used to hold the 60mL mixture of Toluene: Methylene Chloride 2 Dry Boiling Chips: used to help the mixture during boiling
Table of Physical Constants: Name Structure MW (g/mol) MF bp/mp (C) Density (g/cm3) Solubility (g/L) Toluene 92. g/mol C 7 H 8 bp: 111 C mp : -95°C .87 g/ml In water: 0.52 g/L (20 °C) Methylene Chloride
g/mol CH 2 Cl 2 bp: 39.6°C mp : - 96.7°C 1.33 g/cm³ In water: not miscible with water, but it is polar, and miscible with other organic solvents Wikimedia Foundation. (2020). Dichloromethane. Williamson, Kenneth L., and Katherine M. Masters. (2017). Toluene. Procedure & Observations: Procedure Observations
skin and eye irritation. Never leave flames unattended and report any broken equipment to the lab professor. Results & Discussion: Photos taken in the lab attached above
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The results of this experiment showed the starting temperature of the mixture was 25 degrees Celsius. As the temperature increased, Methylene Chloride got closer to its boiling point of 39.6 degrees Celsius, and after reaching its boiling point it vaporized. As the Methylene Chloride separated from the Toluene and became a vapor, it cooled and was collected as a distillate. The boiling points of the two liquids are far apart thus making the liquids easier to separate and purify. At 60 degrees Celsius, we had obtained 20mL of distillate.