Using Freezing-Point Depression to Find Molecular Weight Formal Lab Report Purpose: The purpose of this lab is to be able to use the freezing point of a substance to find the molecular weight of it. To do this‚ we will use the Logger Pro program to obtain the freezing point of lauric acid and a solution of benzoic acid and lauric acid. Then‚ we’ll go calculate the freezing point depression of the solution and the molecular weight of benzoic acid. Procedure Summary: Obtain lab goggles
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wavelength Percentage concentration (methanol: water) Peak H value (height equivalent to a theoretical plate) (mm) 230nm 80:20 Phenol 0.0373 Benzophenone 0.0196 Naphthalene 0.0164 235nm 80:20 Phenol 0.0327 Benzophenone 0.0203 Naphthalene 0.0147 260nm 80:20 Phenol 0.0318 Benzophenone 0.0202 Naphthalene 0.0146 Figure 11: table for the height equivalent of the theoretical plates. It can be observed that the H values or height equivalent to a theoretical plate for phenol at the three wavelengths
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Purpose: The purpose of this lab was to determine the freezing point of pure water‚ the experimental van’t Hoff factor for a substance and the molar mass of an unknown solution. Reagents: 25mL deionized Water ¼ to ½ inches of rock salt 25mL Sodium Nitrate (NaNO3 ) 25mL unknown solution – handle unknown solution carefully Procedure: For part 1‚ the freezing point of deionized water was determined. An ice bath was prepared by filling a 600mL beaker ¾ full of ice and covered with ¼ to
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Freezing and Melting of Water. 10/24 Richard Landolfi Due Date:11/1 Purpose the purpose of this lab is to determine the freezing and melting temperature of water. Freezing temperature‚ the temperature at which a substance turns from a liquid to a solid‚ and melting temperature‚ the temperature at which a substance turns from a solid to a liquid. Hypothesis If the water is at a low temperature then it will freeze
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Triphenylmethanol from Benzophenone Purpose: The purpose of this experiment was to synthesize the tertiary alcohol triphenylmethanol from a Grignard reagent‚ phenyl magnesium bromide. The Grignard reagent was synthesized from bromobenzene and magnesium and then reacted with benzophenone to produce triphenylmethanol. It was important that water be excluded from the reaction‚ in order to prevent the formation of benzene. The reaction of phenyl magnesium bromide and benzophenone was quenched with sulfuric
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Experiment Date: 3/12/2012 Photochemistry: Photoreduction of benzophenone and rearrangement to benzpinacolone Abstract: In this experiment Benzpinacolone was synthesized in a process that contained two steps. First the photoreduction of benzophenone in 2-propanol‚ which was done by placing the flask under sunlightfor the absorption of the UV rays to carry out the reaction. Then the second part was the dehydration of benzpinacol to benzpinacolone‚ where the benzpinacol product was converted
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melt. This only works‚ however‚ if the temperature outside is at or near freezing. If it is too cold outside‚ the ice itself becomes very dry and salt is not as effective in melting it. Salt Reduces Freezing Temperature of Water * Salt works by lowering the freezing temperature of water. Salt water needs to reach a colder temperature than pure water to freeze. This is why salted ice on roads that are near the freezing temperature of pure water (32 degrees Fahrenheit) will melt and not refreeze
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FREEZING FOODS 1. Freezing storage space is valuable. Use it only for high quality meats‚ fruits and vegetables. Do not freeze and store excessively bulky products. 2. Place a variety of foods in your locker or home freezing unit. Avoid long storage of any items. Add new items as rapidly as storage space will permit. 3. If your locker plant or home-unit has a quick-freeze compartment‚ use it. The temperature of this compartment should be held at 0 or below. The time required for freezing should not
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Freezing out profits Synopsis Freezing out profits is an article that discussing on one company which is Cold Cuts Ltd (CC). The managing director for this company is Mr. Dali. It produces Singapore’s only refrigeration parts and specializing in it. He is the one that is responsible for all the decision making that need to be done in the company. CC was essentially a subcontractor of components for customers who were original equipment manufacturers (OEMs). This company not only faced competition
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The media is about paying for egg freezing for female employees until they are ready to become parents. It has been said in the film that freezing the eggs of women helps women compete for talent in a largely male dominated industry. Also‚ it addresses the conflicts between the biological clock and the clockwork of women’s career. Them paying for women to freeze their eggs can help resolve those problems by pushing women’s fertility into the future. One way that this is all consistent with symbolic
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