Preview

Benzoic Acid Synthesis Lab Report

Good Essays
Open Document
Open Document
1525 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Benzoic Acid Synthesis Lab Report
Unit 4 Assessment 2-Benzoic Acid Synthesis
Synthesis and Investigation of Benzoic Acid
Our aims:
Create benzoic acid using benzaldehyde and hydrogen peroxide.
Then remove some impurities from the benzoic acid crystals.
Apparatus:
Titration
Pipette (25 cm3)
Burette (50 cm3)
Retort stand
Clamp
Conical flask (250 cm3)
Volumetric flask (250 cm3) and stopper
White tile
Beakers (250 cm3)
Dropping pipette
Filter funnel
Deionised water
Phenolphthalein indicator
Volumetric flask
Melting point experiment apparatus
Melting point apparatus
Capillaries
Thermometer
Bunsen burner
Recrystallization
Filter paper
Buchner funnel
Conical flask
Specular
Benzaldehyde + hydrogen peroxide
Heat mat
Beaker
Conical flask …show more content…
The number of moles C6H5COOH is 2.34x10-4 moles.
2.34x10-4 was used in 10cm3
Concentration = (2.34x10-4/10) x 1000 = 0.0234
Purity = (0.0234/0.025) x 100 = 93.6%

The titration results showed that the titration were accurate and somewhat concordant. With the results from the titration we could work out the concentration, and then use the concentration value to work out the purity of the benzoic acid. The benzoic acid purity came out at 93.6%, a high value for the purity showing that the recrystallization was very effective in removing impurities.

Conclusion:
When doing this experiment I made a batch of crude benzoic acid, this batch was meant to be used for a titration, recrystallization, six melting points and a TLC experiment. When I started the experiment I believed that I would have enough crystals to complete all experiment with some crystals left over, however once the titration came about I realised that I did not have enough benzoic acid, therefore instead of using a 250cm3 volumetric flask I had to use a 100cm3 flask
Continue Reading
View Writing Issues

You May Also Find These Documents Helpful

  • Satisfactory Essays

    Organic Lab 2583-4
    • 503 Words
    • 3 Pages

    Organic Lab 2583-4

    In another reaction tube, I dissolved 0.080mg of benzoic acid in the minimum volume of hot methanol; I added drops of water to the hot solution.…

    • 503 Words
    • 3 Pages
    Satisfactory Essays
    Read More
  • Good Essays

    2-Naphthol Synthesis Lab Report
    • 304 Words
    • 2 Pages

    2-Naphthol Synthesis Lab Report

    All the reagents and solvents used for synthesizing the title compound were of Analar grade (Merck) and were used as such without further purification. The 2-naphthol derived Mannich base 1-((4-methylpiperazin-1-yl)(phenyl)methyl)naphthalen-2-ol (MPN) was synthesized according to the general procedure described in the literatures [13, 14]. The 2-naphthol (4.33 g, 0.03 mol) was dissolved in 30ml of ethanol and it was mixed with…

    • 304 Words
    • 2 Pages
    Good Essays
    Read More
  • Satisfactory Essays

    Chem 1211K Lab Report
    • 1855 Words
    • 18 Pages

    Chem 1211K Lab Report

    The identification of the melting point of the organic acid was done to find another characteristic of the acid and to test the purity of the recrystallized pure acid. A 2-4 mm layer of unknown sample was placed into a capillary tube sealed on one end. Then the capillary tube was inserted into the side a Bibby Sterlin device. The plateau was set to 200°C on the melting point apparatus. Once the plateau temperature was reached, the sample was watched carefully. When the sample first began to melt and when it was fully melted was recorded. These numbers were the range of the melting point. A slow melting point of the unknown organic acid and a standard sample was completed next. A new plateau was set about 10°C lower than the observed melting point of the unknown sample. This time once the plateau was reached, the heating was no more than 1°C per minute. This gave a much more accurate read of both melting points. If the standard did not melt in the range listed on the label of the bottle, that meant the machine was not working properly. The standard sample and the unknown organic acid melted in their appropriate ranges.…

    • 1855 Words
    • 18 Pages
    Satisfactory Essays
    Read More
  • Better Essays

    Measuring the Melting Points of Compounds and Mixtures
    • 1111 Words
    • 5 Pages

    Measuring the Melting Points of Compounds and Mixtures

    Measuring melting points of benzoic acid and mandelic acid. Capillary tubes were loaded with benzoic acid and mandelic acid powder at about 1-2 mm. Tubes were placed inside the melting apparatus to be heated. Since pure benzoic acid melts at 122-123˚C, the tube was rapidly heated to 110˚C and heated slowly to 1-2˚C per minute till all crystals liquefied. And the same applied to the mandelic acid capillary tube.…

    • 1111 Words
    • 5 Pages
    Better Essays
    Read More
  • Better Essays

    analysis of alum lab
    • 1065 Words
    • 5 Pages

    analysis of alum lab

    The hypothesis is that the alum can be verified by finding the properties; the actual…

    • 1065 Words
    • 5 Pages
    Better Essays
    Read More
  • Good Essays

    Separation of a Mixture of Solids
    • 572 Words
    • 3 Pages

    Separation of a Mixture of Solids

    While the water was boiling with the table salt, sand, and benzoic acid, the water got thick. It was difficult to separate the solids because they would get stuck to the bottom of the Styrofoam cup. In order to separate the iron filings a magnet was used. The solution first needed to be spread out on a piece of paper. As the magnet was ran over the solution, the iron filings were picked up. It took several tries to get all of the iron picked up. To separate the sand, the burner and distilled water was used. As it boiled, it had to be stirred to make sure it was completely dissolved. Having done this twice ensures that the salt and the benzoic acid are completely removed from the sand. An ice bed was necessary to observe the benzoic acid crystallizing. The ice bed allowed the burning benzoic acid to cool down and change appearance and texture. The sand had to be over low heat to be completely dry. No sand splattered which made it effective for the data. To separate the benzoic acid, filtration was used. The mass of the filter paper was 1.1 grams. The ice bath was…

    • 572 Words
    • 3 Pages
    Good Essays
    Read More
  • Satisfactory Essays

    Titration Analysis
    • 505 Words
    • 3 Pages

    Titration Analysis

    Step 4- Use a funnel or just the beaker to pour the sodium hydroxide (not above head) into the volumetric pipette. Use the pipette and the pipette bulb to gather 10 mL of acetic acid and empty into Erlenmeyer flask. Add a few drops of phenolphalein to the flask. Let 9 mL of the sodium hydroxide drain into the flask, placed underneath the volumetric pipette until it turns pink.…

    • 505 Words
    • 3 Pages
    Satisfactory Essays
    Read More
  • Good Essays

    Lab 2 Separation of a Mixture of Solids
    • 493 Words
    • 2 Pages

    Lab 2 Separation of a Mixture of Solids

    I HAVE A LITTLE LEFTOVER BENZOIC ACID AT THE BOTTOM OF THE CUP THAT I COULDN’T GET TO POUR OUT, AND A FEW CRYSTALS LEFT IN WATER AFTER FINISHED WITH THIS STEP THAT APPEARED LATER WHILE EVAPORATING.…

    • 493 Words
    • 2 Pages
    Good Essays
    Read More
  • Satisfactory Essays

    The Effect of Ph on a Food Preservative
    • 690 Words
    • 3 Pages

    The Effect of Ph on a Food Preservative

    To study the affect of pH on a food preservative. Sodium benzoate changed into benzoic acid once the 3 M of HCl was added making it a pH of 2, making the solution acidic. The hydronium ion concentration was high enough that it gave a yield of benzoic acid, which, is very insoluble in water and it formed a precipitate in the solution. The end percent yield was 132.352%, this was due to a few flaws in the experiment. During the filtration process of the experiment the funnel was not working properly and not all the…

    • 690 Words
    • 3 Pages
    Satisfactory Essays
    Read More
  • Good Essays

    Organic Lab Report
    • 916 Words
    • 4 Pages

    Organic Lab Report

    The melting point of a compound is the temperature at which the solid is in equilibrium with its liquid. A solid compounds changes to a liquid when the molecules acquire enough energy to overcome the forces holding them together. A mixture melting point is useful in confirming and used to indentify an unknown compound, which we will be doing in this particular experiment.…

    • 916 Words
    • 4 Pages
    Good Essays
    Read More
  • Good Essays

    Multistep Synthesis of Tetraphenylcyclopentadienone
    • 1664 Words
    • 7 Pages

    Multistep Synthesis of Tetraphenylcyclopentadienone

    The aim of this experiment was to perform a multistep synthesis to form tetraphenylcyclopentadienone. The first step of the reactions was to synthesize benzoin from the condensation of benzaldehyde. A yield of 28.91% benzoin was obtained. The MP of benzoin was 127O-130O C and the IR spectra displayed a carbonyl peak at 3415 cm-1 ,,which represents and OH functional group. The second step of the reaction was to oxidize benzoin to form benzil; this reaction yielded 27.04% benzil. The MP of the benzil was 91O-93O C and the IR spectra revealed no OH functional groups. The last step of the synthesis was a double aldol condensation reaction to form tetraphenylcyclopentadienone; this reaction had a yield of 76.56% and a melting point of 222O-225O C. The IR spectra revealed a ketone carbonyl peak at 1700 cm-1.…

    • 1664 Words
    • 7 Pages
    Good Essays
    Read More
  • Good Essays

    recrystallization of Benzoic acid
    • 879 Words
    • 6 Pages

    recrystallization of Benzoic acid

    The 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% Ethanol, Petroleum Ether, Acetone and distilled water) were used to identify which one is an ideal solvent. An ideal solvent is insoluble in room temperature and soluble in hot solvent. 0.5mL of each solvent were added into four reaction tube with 25mg`of pure Benzoic acid. After careful observation, distilled water fit the requirement. During recrystallization, 0.5 grams of Benzoic acid were added into a 50mL flask with 10 mL distilled water. After performing this experiment, the first crop had a mass of .334 grams with a second crop of 0.0grams. The percent recovery yields 66.8%, which means that according to expected value of 70% this data confirms that the Benzoic is pure. Finally, the melting range was between 120 to 122 degrees which again confirms that the recrystallized Benzoic acid has been purified completely.…

    • 879 Words
    • 6 Pages
    Good Essays
    Read More
  • Good Essays

    The Extraction of Benzoic Acid
    • 2064 Words
    • 9 Pages

    The Extraction of Benzoic Acid

    Extraction is a purification technique used in organic chemistry to separate compounds from a mixture of two or more compounds. There are three different extraction techniques: liquid-liquid extraction, solid-liquid extraction and chemically active extraction. All three types of extraction follow the same principle. Organic molecules dissolve in organic solvents and polar molecules dissolve in aqueous solvents. This phenomenon is observed because of the intermolecular forces between solvent and solute molecules. For example, in aqueous solvents, the polar solute can interact with the solvent via hydrogen bonding, electrostatic forces, ion dipole forces, dipole-dipole forces and London forces. All of these can help a polar solute dissolve in an aqueous solvent. Polar molecules can be involved in these interactions because they have a partial charge. This partial charge is brought upon by the differences in electronegativity between the atoms in the molecule. The difference in electronegativity created a dipole in the molecule. The partially positive hydrogen atoms in H2O molecules are then able to interact with the partially negative part of the molecule and the partially negative oxygen atom in the H2O molecule is able to interact with the partially positive parts of the molecule. The exception is London forces, which is an interaction that nonpolar molecules can participate in as well due to the transient dipole moments that exist in them.…

    • 2064 Words
    • 9 Pages
    Good Essays
    Read More
  • Good Essays

    Carboxylic Acid Lab Report
    • 256 Words
    • 2 Pages

    Carboxylic Acid Lab Report

    Carboxylic acids are compounds which contain a carboxyl group, -COOH group, where the -COOH group is attached either to a hydrogen atom or to an alkyl group. One of the example of carboxylic acid is benzoic acid( benzene carboxylic acid) which has a benzene connected to the carboxyl carboxyl group, -COOH group. It has a formula of C6H5COOH.…

    • 256 Words
    • 2 Pages
    Good Essays
    Read More
  • Good Essays

    Acetylsalicylic Acid Synthesis Lab Report
    • 404 Words
    • 2 Pages

    Acetylsalicylic Acid Synthesis Lab Report

    Acetylsalicylic acid is the active pharmaceutical ingredient in aspirin and can be synthesized by the esterification reaction of salicylic acid and acetic anhydride in the presence of an acid catalyst. An esterification reaction is when an acid is converted into an ester by combining with an alcohol and removing a water molecule. When heating the salicylic acid mixture in the warm water bath, the mixture should be removed from the bath within 8 minutes, to reduce the chance of the acetylsalicylic acid decomposing. The purpose of this procedure is to isolate acetylsalicylic acid from its accompanied acid catalyst, unreacted salicylic acid, acetic anhydride, and other impurities. Their removal can be done by crystallization, a purification technique in which, upon cooling, product crystals will be separated from impurities that are present in the solution, which can then be filtered off using a vacuum. In this procedure, acetic anhydride is used to wash the reactants, and phosphoric acid is used as a catalyst to…

    • 404 Words
    • 2 Pages
    Good Essays
    Read More