In this experiment, unknown B was a solid mixture containing two compounds of interests, 1,4-dimethoxybenzene and neutral benzoic acid. These compounds were separated by extraction and washing, and liquid-liquid extraction was specifically performed. Extraction is the process by which a compound of interest is selectively removed from impurities, and washing is the process by which unwanted products or impurities are selectively removed from the desired product.
In liquid-liquid extraction, unknown B was dissolved sequentially into two immiscible liquids via a separatory funnel. The differences in solubility of the liquid solvents was important because it allowed 1,4-dimethoxybenzene and neutral benzoic acid to eventually separate or extract…
Aims of Experiment
1. To extract benzoic acid from the toluene-benzoic acid mixture, using oxidation-reduction reaction (chemical properties) and difference of solubility (physical properties) –Expt. 1
2. To learn how to recrystallize the solid organic compounds well for getting more purified compounds –Expt. 2
3. To find which differences between raw product and recrystallized product are observed. –Expt. 2
4. To determine melting point range of organic compounds with digital melting point…
working with very impure benzoic acid. The benzoic acid we were given was made by the 102 chemistry students, meaning that it wasn’t properly made. Students have said that they were rushed and weren’t able to take their time to filter the solid out of the solution. We had to do this for our 102 lab, and I know that our class was being rushed, and it didn’t help that this was the first time working with a funnel filtration. Working with a possible impure benzoic acid is an important thing to note…
This experiment was conducted to practice a variety of techniques in organic chemistry: separation, mechanisms, acid-base reactions, evaporation, recrystallization, and identification. The goal of this experiment was to identify the unknown mixture of two compounds. The two compounds were separated first by altering the acid components solubility through deprotonation, and then protonating the acid component again to form the separated precipitate. The ether in the neutral layer was evaporated,…
Thursday, 09 November 2016
The Separation of Three Organic Compounds by Acid-Base Reactions and Liquid-Liquid Extractions
The purpose of the experiment was to isolate the three mixtures 9-fluorenone , benzoic acid and benzocaine by the liquid-liquid extraction method and the acid-base reaction technique. Using the acid-base reaction technique, the acid and base are neutralized, producing salt and water. By using the liquid-liquid extraction method, two…
The experiment that will be conducted is the preparation of benzoic acid.
Benzoic acid is a carboxylic acid and this has been established in the 16th century. The molecular structure of benzoic acid can be seen in the following figure.
Figure 1 – Molecular Structure
Benzoic acid is used to prepare esters with the very high boiling points and is used as plasticisers. Plasticisers are compounds that are added to plastics to make it softer and…
Microwave (MW) assisted Esterification of Benzoic Acid (BA) offers the advantage of transformation of energy and heating throughout the volume efficiently in a shorter period and eliminates the use of excess solvent, during the course of reaction. The present study aims to assess the conversion and selectivity for the production of methyl benzoate compounds by esterification of benzoic acid using microwave irradiation. Effects of operating parameters such as reaction time, feed composition,…
EXTRACTION OF BENZOIC ACID
Candidate’s Name: Raajeswari A/P Radahakrishnan
Student ID: SCM-023562
Group Member’s Name: Angela A/P Gunasegaran
Shubashinee A/P Murugan
Lecturer/ Supervisor: Ms Nazlina & Dr Ong Chi Siang
Date of Submission: 13 October 2015
This experiment is about extraction of benzoic acid from kerosene by water droplets that was conducted on 6 October 2015 with few group of students. The main purpose of this experiment is to determine the overall…
were used to purify and identify the product of the reaction?
3. Describe acid-base extraction and how it was being used in this experiment?
4. Describe recrystallization and how it was being used in this experiment?
5. Describe mixed melting point and how it was being used in this experiment?
6. What was the identity of the unknown acid?
7. What yield and percent yield were obtained?
8. What percent recovery was obtained from recrystallization?
9. What melting point data were obtained?…
Observations or reactions:
Separation of the basic component:
When 2ml of 3M HCl was added to the mixture of Benzoic acid, Ethyl 4-aminobenzoate, 9-Fluorenone, diethyl ether, two layers were created, an organic yellow top layer and a clear aqueous bottom layer. The clear layer (basic layer) was extracted and placed into a container where 6M NaOH was add to the solution. The addition of NaOH made the solution basic, and created white flakes in the solution. The white flakes were separated by…