This website uses cookies to ensure you have the best experience. Learn more

Recrystallization Essay

1269 words - 5 pages

Objective:1. To determine the percent recovery from recrytalisation2. To determine the melting point of the crystals formed3. To purify a solid by recrystalisation.Apparatus:- Erlenmeyer flask- Filter paper- Short-stemmed funnel- Buchner funnelMaterial:- Benzoic acid- Charcoal- Boiling chipsProcedure:About 2.0g of crude benzoic acid was weighed into a 250mL Erlenmeyer flask.100 - 200mL of water with boiling chips were heated to boiling in a beaker on a hot plate.An Erlenmeyer flask with a little water and boiling chips in it was heated. A short-stemmed funnel was rested at its neck and a filter paper was fluted to fit the funnel.A few boiling chips were added to the benzoic acid. Hot water was added to it until the benzoic acid dissolve.The flask was kept on the hot plate once the hot water was added to keep it hot.Decolorizing charcoal was added because colored impurities were present.The hot solution was filtered through the fluted filter paper into the heated flask.The original flask and the filter paper were rinsed with a little hot water.The solution of benzoic acid was removed from the hot plate and allowed to cool.After 15 minutes, the flask was cooled in an ice bath.The crystals formed were collected by suction filtration using Buchner funnel.A wet filter paper was fit to the Buchner funnel before pouring the crystals in.The crystals on the wet filter paper were transferred onto a fresh piece of filter paper and were allowed to air-dry.Once the crystals are dried, the weight was taken and recorded.Observations & Results:Original weight of benzoic acid = 1.95gWeight of filter paper = 0.54gWeight of filter paper + benzoic acid crystal = 2.32gWeight of benzoic acidcompound recovered after recrystallization = 2.32 - 0.54= 1.78gweight of compound recoveredPercent Recovery = ---------------------------------------- x 100 %original weight of compound1.78g= -------- x 100 %1.95g= 91.28 %Melting point of crystal = 125oC - 126oCDiscussion:We started off the experiment by weighing 1.95g of benzoic acid which was taken as the original weight that is 1.95g in this experiment. And then, seven steps were followed in order to complete the recrystalization process and finally the weight of the recovered compound was taken which is, 1.78g, to calculate the percent recovery.The first step out of the seven steps mentioned earlier is to identify a good solvent. In this experiment, water was chosen as the solvent because benzoic acid is relatively insoluble in water at room temperature but much more soluble in water at higher temperature. This difference in solubility at hot versus cold temperatures is essential for the recrystallization process. Other than that, water is a good solvent because it does not react with benzoic acid. At the same time, water is also a good solvent for the benzoic acid impurities at both high and low temperatures.The second step is to dissolve the sample in the minimum volume of hot water to get a good yield of a saturated...

Find Another Essay On Recrystallization

Chemistry lab report

1106 words - 4 pages The goal of the project was to characterize an "unknown" organic acid in order to make a proper identification of the acid, while learning proper techniques for scientific measurement and analysis of error. In order to ensure the most accurate data, a purification was performed by the process of recrystallization. To perform the recrystallization the powder was dissolved in a minimal amount of hot ethanol/H2O solvent that allowed the unknown

Aldol Synthesis of Dibenzalacetone Essay

761 words - 3 pages itself to yield one product.Procedure: Followed according to the lab manual.Results:DataValueWeight of crude crystal1.6 gWeight of recrystallization crystal0.48 gColor of crystalOrange-yellow% recovery of recrystallization:(0.48 g)/(1.6 g) ×100 %=30%Theoretical yield (from prelab): 1.177 gPercent yield(0.48 g)/(1.177 g) ×100 %=40.78% ConclusionThrough this experiment, aldehyde reacts with itself in the presence of acetone and base

Title: Nucleophillic Substitution Reaction

1138 words - 5 pages anthacene.Procedure: The procedure is followed according to the lab manual.Result: refer to the datasheet.% recovery of recrystallization:Mass of crystal before recrystallization: 0.5822 gMass of crystal after recrystallization: 0.549 g% recovery = 94.3 %Melting point = 262˚C - 266˚CConclusionThe reaction of maleic anhydride and anthracene produces 10-dihydroanthracene-9,10-,-succinic acid anhydride. The use of xylene as a solvent was to enable

Organic Synthesis of Aspirin Chemistry Formal Lab

1385 words - 6 pages Experiment Four: Organic Synthesis of AspirinAbstractThe purpose of this experiment is to synthesize a common organic product called acetylsalicylic acid (aspirin), and to become familiar with the optimum conditions needed for successful yields. Aspirin is produced from an acid catalyzed reaction between salicylic acid with acetic anhydride. The crystalline aspirin is synthesized and purified by recrystallization, although there is not a hundred

Sedimentary Rock Formation

735 words - 3 pages stages. First ocean waves, rivers, glaciers, wind or landslides transport loose, solid particles from weathering and erosion of preexisting rock. The particles are named sediment (Rocks of Idaho). Next the loose sediment is converted into sedimentary rock in compaction, cementation, and recrystallization. Compaction is when the air and water is pushed out of the bottom layer of sediment as more layers build up and press down on it. Cementation is


2003 words - 9 pages product results from either a syn or anti addition of Br2 to the alkene. Recrystallization using ethanol and water solvent mixture was used to purify the crude product and melting point was implemented in order to see which products were synthesized. The syn addition products (2S, 3S- and 2R, 3R) 2,3-dibromo-3-phenylpropanoic acid have a melting range of 93.5-95 ᵒC. The anti addition products (2S, 3R- and 2R, 3S) 2,3-dibromo-3-phenylpropanoic acid

Microstructural Evolution, Mechanical Properties and Corrosion Behavior of Low Cost Ti-Fe-O-N Alloys

1728 words - 7 pages to study the effect of processing parameters on the microstructural features of Ti-Fe-O-N alloy. This will foster a better understanding of the performance (mechanical properties and corrosion behaviour) of the alloy in service. 2. Aim The aim of this research work is to evaluate the influence of heat treatment processing parameters (homogenizing temperature, degree of deformation, deformation temperature, recrystallization time


863 words - 3 pages extract (flavourings) and brake fluids. 1 Butanol is mainly important for its solvent power for oils and dyes. It is too used in the removal of water from substances, in the extraction of drugs and in the manufacture of perfumes (particularly as an important raw material for the preparation of artificial musk). Also, in the recrystallization of chemicals, and as a chemical intermediate in the manufacture of plastics and for the separation of solids

Asprin Experiment on Blackboard

1094 words - 5 pages Aspirin was prepared according to the protocol provided on Blackboard. The three sections to this experiment were 1. Synthesis of Aspirin, 2. Recrystallization of Aspirin, and 3. Characterization of Aspirin. In the first section, the Synthesis of Aspirin, salicylic acid was weight to be 3.029 grams using mass by difference since it was weighed on a 150 milliliter beaker. 9.23 milliliters of the acetic anhydride and 14 drops of 85 percent


1222 words - 5 pages inorganic molecules from the organic layer performs neutral extraction.Acidic extractions are used to convert an organic base into its water-soluble form so it can be moved into an aqueous layer.Basic extractions are used to convert an organic acid into a carboxylic salt so it can be moved into an aqueous layer.Steps to identify unknown liquidsseparate the components of the mixture using separatory funnelperform recrystallization on unknown

The Gum Benzoin Tree

3705 words - 15 pages correct personal protective equipment (PPE) should be used at all times and a well ventilated work space should be maintained. Benzoic acid is stable under standard/normal laboratory conditions (SLC). Organic compounds are compounds that consist of carbons that are covalently bonded together. Recrystallization is the method of purifying solid organic compounds. Purification or purifying is the removal of all contaminates/impurities from inside

Similar Essays

Recrystallization Of Benzoic Acid Essay

883 words - 4 pages Mabel M. KimbleSeptember 21, 2014Chemistry 234Recrystallization of Benzoic AcidAbstractThe recrystallization of Benzoic Acid was performed to fully master the ability to purify a solid compound. This form of purification technique is especially important in chemical identification, where the melting point of the compound is taken to confirm its purity. In order to perform recrystallization a solubility test much be completed. Four solvents (95

Recrystallization Of Benzoic Acid Essay

883 words - 4 pages Mabel M. KimbleSeptember 21, 2014Chemistry 234Recrystallization of Benzoic AcidAbstractThe recrystallization of Benzoic Acid was performed to fully master the ability to purify a solid compound. This form of purification technique is especially important in chemical identification, where the melting point of the compound is taken to confirm its purity. In order to perform recrystallization a solubility test much be completed. Four solvents (95

Melting Point Lab Essay

1376 words - 6 pages Melting Points and Re-crystallizingPurpose:The purpose of this experiment is to select a suitable recrystallizing solvent, to be able to purify and separate acetanilide from a mixture by process of recrystallization. Organic compounds that are synthesized in labs or isolated from natural recourses often have been tainted by impurities. Recrystallization is a process that removes these impurities from solid organic compounds that are at room

Electrophilic Aromatic Bromination Organic Chemistry Lab Report

913 words - 4 pages , recrystallization was performed to purify the product and melting point data was collected, aggregated, and compared to standards. Theory The nature of the substituent on a benzene ring determines the activating and directing effects of electrophilic aromatic substitution. In the case of this experiment, all of the substituents were activating and ortho/para directors. This is because the substituents were all electron donating groups, creating electron density