The purpose of this laboratory assignment was two-fold, first, we were to
demonstrate the extraction of acids and bases, finally, determining what
unknowns were present. Second, we were to extract caffeine from tea. These two
assignment will be documented in two separate entities.
Introduction: Acid/base extraction involves carrying out simple acid/base
reactions in order to separate strong organic acids, weak organic acids neutral
organic compounds and basic organic substances. The procedure for this
laboratory assignment are on the following pages.
3) Separation of Carboxylic Acid, a Phenol and a Neutral Substance
The purpose of this acid/base extraction is to separate a mixture of
equal parts of benzoic acid(strong acid) and 2-naphthanol(weak base) and 1,4-
dimethoxybenzene(neutral) by extracting from tert-butylmethyl ether(very
volatile).The goal of this experiment was to identify the three components in
the mixture and to determine the percent recovery of each from the mixture.
4) Separation of a Neutral and Basic Substance
A mixture of equal parts of a neutral substance containing either
naphthalene or benzoin and a basic substance containing either 4-chloroaniline
or ethyl 4-aminobenzoate were to be separated by extraction from an ether
solution. Once the separation took place, and crystallization was carried out,
it became possible to determine what components were in the unknown mixture, by
means of a melting point determination.
Dissolve 3.05g Phenol Mixture was a golden-Neutral acid
in 30ml brown/yellow color t-butyl methyl ether in
Erlenmeyer flask and transfer mixture to 125ml separatory funnel using little
ether to complete the transfer
Add 10 ml of water Organic layer=mixture
Add 10 ml saturated aqueous Sodium bicarbonate NaHCO3
dissolves in solution sodium bicarbonate ...
... middle of paper ...
salicylate is a Pasteur pipette while the isolated(white color)
formed. beaker is in the ice bath then vacuum filter.
Caffeine beaker: 51.61g
.05g = 50mg
% yield = .05g x 100% = 20%
Caffeine salicylate: 17.198g
% yield = .062g x 100% = 25%
According to the HPLC graph that follows, my product was very pure. The
actual melting point of caffeine salicylate is 137 degree(C), my product was
found to have a melting point of 138 degrees (C). As before, of course this
experiment was not done completely error-free, the error is due almost entirely
on human error.
Need Writing Help?
Get feedback on grammar, clarity, concision and logic instantly.Check your paper »
- Acid Base Extraction The purpose of this laboratory assignment was two-fold, first, we were to demonstrate the extraction of acids and bases, finally, determining what unknowns were present. Second, we were to extract caffeine from tea. These two assignment will be documented in two separate entities. Introduction: Acid/base extraction involves carrying out simple acid/base reactions in order to separate strong organic acids, weak organic acids neutral organic compounds and basic organic substances.... [tags: essays research papers]
1509 words (4.3 pages)
The Extraction Procedure For Separate The Acid, Base And Neutral Components Of The Solution Into Separate Phases
- The extraction procedure was undertaken in order to separate the acid, base and neutral components of the solution into separate phases. This procedure was executed using different solvents with different polarities in order to extract the different solutes. The recrystallization procedure was undertaken in order to purify the solutes further by removing any contaminants. This was done by using hot solvent and then allowing it to cool, which causes the compound to precipitate out. This creates purified crystals that have less other associated compounds.... [tags: Solubility, Solvent, Solution, Acetic acid]
818 words (2.3 pages)
Preparation A Acid Base Extraction Technique For Separate Organic Compounds Successfully By Separatory Funnel Preforming On Two Liquids
- The Objective The purpose of this experiment was to learn and preform an acid-base extraction technique to separate organic compounds successfully and obtaining amounts of each component in the mixture. In this experiment, the separation will be done by separatory funnel preforming on two liquids that are immiscible from two layers when added together. The individual components of Phensuprin (Acetylsalicylic acid, Acetanilide, and Sucrose as a filler) was separated based upon their solubility and reactivity, and the amount of each component in the mixture was obtained.... [tags: Solvent, Sodium bicarbonate, Hydrochloric acid]
1470 words (4.2 pages)
- Exaction is where a solute is transfer from solvent A to solvent B (Ketcha, 47). A possible method to do this is changing the chemical makeup by using acid-base reactions (Ketcha, 42). The acid-base reactions change the solubility of the solute. If the original solute is ionic and is dissolvable is solvent A but not B, then adding the acid HCl would change the solute to its conjugate acid. The resulting acid would then be soluble in B but not A. To revert the change, just add the base NaOH to the solution.... [tags: Solvent, Solubility, Chemistry, Solution]
841 words (2.4 pages)
- In this experiment, a mixture of three substances (benzoic acid, 2-naphthol, and 1-4 dimethoxybenzene) will be separated based off acidity strength using the liquid-liquid extraction technique through a separatory funnel. Benzoic acid and 2-napthol will be converted into ionic salts when reacting with their appropriate bases (sodium bicarbonate and sodium hydroxide). Both ionic salts will then form solids through the addition of acidic HCl. Neutral 1,4 – dimethoxybenzene forms a solid through the evaporation of ether.... [tags: Acid, Water, Sodium chloride, Chemistry]
908 words (2.6 pages)
- In order to separate the mixture of fluorene, o-toluic acid, and 1, 4-dibromobenzene, the previously learned techniques of extraction and crystallization are needed to perform the experiment. First, 10.0 mL of diethyl ether would be added to the mixture in a centrifuge tube (1) and shaken until the mixture completely dissolved (2). Diethyl ether is the best solvent for dissolving the mixture, because though it is a polar molecule, its ethyl groups make it a nonpolar solvent. The compounds, fluorene and 1, 4-dibromobenzene, are also nonpolar; therefore, it would be easier for it to be dissolved in this organic solvent.... [tags: Solvent, Ethanol, Solubility, Sodium chloride]
1006 words (2.9 pages)
- In this experiment, the goal is to separate naphthalene and benzoic acid from one gram of a crude mixture containing them both, using extraction. A general requirement of a solvent in extraction is solvating one of the pure compounds in solution but not the other. Position in the separatory funnel is determined by density of each layer. The denser layer will be on the bottom of the separatory funnel while the less dense layer will be the top layer of the separatory funnel. For extraction to be used as an effective method for separation, the components of a mixture that need to be recovered must not be soluble in the same solvent.... [tags: Solvent, Solubility, Chemistry, Benzene]
1080 words (3.1 pages)
- Modern biochemical study and analysis of nucleic acids have been heavily dominated by electrophoresis and polymerase chain reaction techniques, as the former allows for relatively inexpensive and accessible resolution and visualization of nucleic acids according to basic chemical properties such as molecular charge and weight, and the latter quickly increases the concentration of nucleic acids, normally found in cells in minute amounts, to a level easily analyzed by modern biochemical techniques.... [tags: pcr, enzymes, nucleic acids]
829 words (2.4 pages)
- The most widely used method for synthesizing citric acid was discovered by an American chemist named James Currie in 1917 in order to contend with the lack of citrus imports caused by the First World War. This method requires the fungus culture “Aspergillus niger”. This mould is fairly common in nature but special strains are used by the major citric acid producing companies to increase the fungus’s production of citric acid. This method involves substances that contain glucose such as simple sugar or molasses being fed to the fungus.... [tags: Chemistry]
1704 words (4.9 pages)
- Extraction To obtain oils from plant materials steam distillation is typically used. Solvent extraction is also used to create a resinoid (resembling characteristics of resin). Solvent extraction is commonly used with volatile substances that may be lost with distillation. Solvent used are pentane, hexane, and mixes of solvents such as ethyl acetate and hexane which is commonly used in place of benzene (see Figure 2). Gas-Liquid Chromatography Gas-Liquid Chromatography is the process of separating complex mixtures into the components and measuring the individual components.... [tags: extraction, resinoid, benzene]
1160 words (3.3 pages)