Friedel-Crafts alkylation was performed by adding t-butyl alcohol to p-dimethoxybenzene in order to produce 1‚4-di-t-butyl-2‚5-dimethoxybenzene. This reaction yielded 0.009g of 1‚4-di-t-butyl-2‚5-dimethoxybenzene having a percent yield of 5%‚ and a melting point range of 54.8°C-56.9°C. Introduction This reaction is designed to put functional groups onto aromatic rings. This is done through an electrophilic aromatic substitution where a positive species is strong enough to pull electrons out of the ring
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Melting Points Elizabeth McGrail Organic Chemistry I 25 January 2013 ABSTRACT The objectives of this lab are‚ as follows; to understand what occurs at the molecular level when a substance melts; to understand the primary purpose of melting point data; to demonstrate the technique for obtaining the melting point of an organic substance; and to explain the effect of impurities on the melting point of a substance. Through the experimentation of three substances‚ tetracosane‚ 1-tetradecanol and
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Determine the melting points of two organic compounds known to have the same melting range when pure. b) Determine the mixture melting point of a mixture of the two pure compounds. c) Identify an unknown organic compound by determining its melting point and mixture melting point. Procedure and Observations: Using the procedure outlined in Appendix A of the Lab Manual‚ approximately equal samples of p-Nitrophenol and acetanilide‚ which are known to have the same melting range of 113-114
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Experiment 3 Colligative Properties Freezing-Point Depression and Molar Mass By‚ Andrew Klingsporn Joby J. Chem 212 Dr. Chandana Meegoda 2/11/2009 Purpose The purpose of this experiment is to determine the Molar Mass of an unknown substance using its freezing point depression. Introduction There are two types of mixtures; homogenous and heterogeneous. Homogenous mixtures have components that are uniformly mixed‚ while heterogeneous mixtures do not. A solution is a homogenous mixture
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Results My unknown sample was number 18. I did three melting point trials‚ which resulted in a melting point range of approximately 120°C to 122°C‚ as shown in Table 1. I also did two mixed melting point trials using Benzoic Acid and Succinimide‚ as shown in Table 2. Percent recovery is 28.26 grams. Table 1: Unknown Melting Point Trials Trial Melting Point 1 120°C – 122°C 2 120°C – 122°C 3 119°C - 122°C Table 2: Mixed Melting Point Trials Trial Benzoic Acid MP Unknown #18 MP Succinimide
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Angela Pierre Chem 112 Lab Due: 03/05/2015 Lab Report 14 Questions 1. Part A.3. Some of the cyclohexane solvent vaporized during the temperature versus time measurement. Will this loss of cyclohexane result in its freezing point being recorded as too high‚ too low‚ or unaffected? Explain. -The freezing point will be higher because the loss of solvent means that the molarity of solute is too high. The melting point will be lower than expected. 5. Part B.2. The solute dissociates slightly in the
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Introduction The purpose of the experiment was to determine the melting points of compounds using a Mel-Temp device. The melting point of naphthalene‚ urea‚ and sulfanilamide are found. This is then followed by the measuring of an unknown compound‚ and an impure sample (a small amount of naphthalene mixed with the unknown). Experiment In the lab‚ the height of the chemical in the capillary was set to 2-3 mm thickness. The voltage at the Mel-Temp started at a low setting of 1.5-2. The heat was
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key concepts in this experiment is the term freezing point depression. The definition of this phrase is that when a solute is dissolved into a solvent‚ their collective boiling point will be less than that of the original boiling point of the solvent. This incidentally leads to another important definition‚ the colligative properties of a solution. This means a particular set of characteristics that are unique to that solution. As the freezing point of the solution decreases‚ the solution then attains
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repCHEMISTRY I - LABORATORY EXERCISE MANUAL LABORATORY EXERCISE 10: Melting Point and Boiling Point Determination This is a traditional lab. You’ll simply follow the step-by-step procedure‚ keeping records of your measurements and observations. Each student will write their own lab report‚ which should include the following: Name: Names of lab partners: Date of Experiment: Date Report Submitted TITLE: Purpose: A brief statement about what the experiment is designed to determine
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Organic Chemistry Lab/ Chem 234 02/17/13 Lab 2: Melting Points Purpose: To determine the purity of a substance using melting point as physical property. We must also learn how to identify an unknown compound using its melting point. We got to identify an unknown compound using mixture melting point and finally we must learn to obtain an accurate melting point using Mel-Temp apparatus. Procedure: Set voltage to obtain the desired heating rate at the anticipated melting point range. The voltage
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