Aim : In this experiment, aspirin is to be prepared via an esterification reaction and purified through recrystallization. The purity of the synthesised aspirin is determined through melting point determination. Introduction : One of the most widely used medicine is aspirin. It is best known for its pain relief for mild headaches, toothaches and muscle aches. It also acts as a nonsteroidal anti-inflammatory drug by providing relief to the swelling. Salicin, an active ingredient in salicylic acid
acid-catalyzed addition of water to a carbon-carbon double bond is the hydration of alkenes, this leads to the formation of an alcohol. An equilibrium is established between two competing processes; hydration is the opposite of a dehydration reaction. The position of the equilibrium is determined by the conditions of the reaction; hydration of a double bond demands an excess of water to move the reaction towards completion, and dehydration of an alcohol demands the removal of water in order to complete
INTRODUCTION In this experiment, the technique of liquid-liquid extraction will be used to separate compounds in a mixture using immiscible solvents. Each separated compound will then be evaporated/dried into a solid and used to obtain melting points to identify each compound in the mixture. Throughout experiment, pH levels needed to be managed closely. DATA AND CALCULATIONS PART A MASS OF DRY RECOVERED BENZOIC ACID: 0.0111g MASS OF BENZOIC ACID USED
The next experiment is to purify impure fluorene, using the same techniques as the previous experiment. In order to crystallize fluorene, the ideal solvent have to be determined from toluene, water, and methyl alcohol. Solubility tests were able to confirm that methyl alcohol is the best solution for crystallizing fluorene, as stated in the results. Though methyl alcohol was the best solvent for this experiment, additional solvent was needed to dissolve the fluorene, because methanol has a high evaporating
This experiment was executed to study the reduction of a ketone to produce a secondary alcohol. This can be seen in Equation 1 below: Using sodium borohydride (NaBH4) as a reducing agent, the starting molecule of 9-fluorenone was reduced to 9-fluorenol. In Equation 2 shown below, the sodium borohydride is used to reduce the C=O bonds to C-OH bonds. The objective of this experiment was to not only reduce 9-fluorenone to 9-fluorenol, but also to analyze the product through melting point
solvents, such as water, and nonpolar compounds are more likely to dissolve in nonpolar solvents. The most polar bonds have the largest electronegativity difference between the atoms in the bond and the highest boiling points. The attractive forces between polar molecules are dipole forces. These attractive forces of dipoles increase the boiling point. The stronger these forces are, the more the compound must be heated to overcome the attractions, therefore, the higher the melting and boiling points
to purify an impure substance. The recrystallization experiment composed of two parts. The first part consisted of acquiring crude acetanilide, which is an impure substance, and purifying the solid compound through different method. The second part of the experiment required time for the purified acetanilide to recrystallize. The recovered acetanilide was then weighed and its melting point was taken. During the first part of the experiment, about 1.520 grams of crude acetanilide was weighed out
do not mix together and form an immiscible layer. One is usually an aqueous solution that is water or exhibits properties like water such as hydrogen bonding, and the other is and organic solvent that display little to no polarity and Vander Waal forces at best. The discrepancy in polarity causes the separation of solvents, with the more dense solvent on the bottom of the container. In this experiment, this concept is implemented
Sarah Min CHEM 143A: Section A03 A10627548 April 14, 2015 Lab Report 1 - Recrystallization and Identification of Unknown Introduction The main concept in this experiment is recrystallization. Recrystallization is the process where the solute (a crystalline material) is dissolved in a hot solvent. The heated solution is filtered (generally via vacuum or gravity filtration) and is returned back to its solid crystalline state when the solution cools down. Recrystallization is best for isolating and
Purpose: The purpose of this experiment was to conduct an examination that would determine how different fats function in different settings. . There are a variety of ways that this could be accomplished, for this experiment fats were used to determine the affect they would have on the volume of creams. Determining the different fats melting point allowed the teams to determine the fat and water content of each fat used. The effect on pastry through the use of varying water content and fats was also