Task 1 M1 Describe the scientific principles behind each of the three procedure above. Vacuum filtration is a procedure when a sold needs separating from a solvent to react the mixture. Then the mixture of a solid is measured through the filtration paper in a Buhner funnel. The liquid is drained through the funnel into the flask.
Once 3-4 readings for the solution were collected, the 2M NaOH was added to the solution. The lid was quickly replaced in order to prevent heat from escaping and not being recorded by the temperature probe. The cup was swirled until the temperature reached a peak and began decreasing. After the 180s had passed, data collection ended. The solution was discarded into the waste bin, and the materials were washed.
Throughout the mixing process, the clear red solution slowly changes to a denser red solution (Appendix figure 23). A thermometer was used for temperature checking. The beaker was removed from the hot plate when the temperature was found to be higher than 50 ℃. This was done to prevent a sudden gelation happen before all the active dissolved in the ethylene glycol. Moderate heating of the solution for a period of time is allowed to obtain a wet gel (Appendix figure 24).
Referring to Table 1, the reactants for each run were transferred to an Erlenmeyer Flask (250 mL) via a buret. Using a precision pipette, the volume of I3- required for each run was carefully extracted and poured into the flask containing all of the reactants. Immediately after the Iodine solution was placed in the flask, the LabQuest began collection data. Meanwhile, a small portion of the solution, was used to rinse the cuvette, then using a disposable pipette a small amount of the solution was transferred to the cuvette (approx. ¾).
Using filtration sodium acetate was separated, and the filtrate was evaporated to obtain syrup and fractionated at a boiling point of 133-136 °C. The obtained product dissolved in hydrogen bromide of glacial acetic acid and this mixture reaction kept in an ice bath for 1hr. According to procedure, the product was methylated to obtain 1bromo-2, 3, 4, 6-tetramethylglucose.
Abstract In this experiment, the reaction kinetics of the hydrolysis of t-butyl chloride, (CH3)3CCl, was studied. The experiment was to determine the rate constant of the reaction, as well as the effects of solvent composition on the rate of reaction. A 50/50 V/V isopropanol/water solvent mixture was prepared and 1cm3 of (CH3)3CCl was added. At specific instances, aliquots of the reaction mixture were withdrawn and quenched with acetone.
The resin that had stuck to the sides of the burette was washed down by pipetting extra pH 3 citrate buffer along the sides. The column was tapped to ensure that the settled resin formed a level surface. After all of the resin settled, the buffer was drained into a waster beaker until the level of the buffer reached the top surface of the resin. For the remainder of the experiment, the top surface of the resin was not allowed to dry
In the lab, “Properties of Hydrates,” the purpose was to compare the properties of several well observable hydrates and to determine if dehydration is a reversible or irreversible change. The lab consisted of attaining a pea-size sample of each compound, burning it over a bunsen burner, and comparing the starting mass and the mass lost after the combustion. These results are important to be able to identify a variety of different chemicals that contain water molecules as part of their crystalline structure. Some can be removed by heating (resulting in evaporation) and some remain mostly unchanged. In this lab the answer will be found.
The ester studied was “3,” the acid used was 9.5 mL of “B,” and the alcohol used was 18.1 mL of “C.” A few substances were added to augment the production of the ester. Sulfuric acid (H2SO4) was added using a dropper bottle to catalyze the reaction. The desiccant in this reaction was drierite and was used to absorb the water byproduct. This prevented the ester from breaking apart into its constituents. The cold finger condenser was used to trap evaporated gas from the heated mixture, and condense it back into
To do this, put 10-15 mL of solution in a test tube and secure it to the stand. Then take a stopper with two holes on the top, and in one hole put the tube, and in the other put the lab quest ( to keep track of the temperature). Fill a beaker with cold water and put another test tube inside of it and
Sodium hydroxide solution with a volume of 6.00 mL and a molarity of 3.00 M was transferred into a 50 mL beaker using a volumetric pipette. While swirling the phosphoric acid solution in the Erlenmeyer flask, the sodium hydroxide solution was added to it a few drops at a time using a disposable plastic pipette. The After all the sodium hydroxide was transferred, the flask was rinsed with 2 mL of deionized water and added to the flask with the reaction mixture and swirled for an additional minute. A clean, dry evaporating dish with a watch glass was then weighed and recorded to 0.001 g. The reaction mixture was then transferred to the evaporating dish.
Purpose and Techniques: This experiment has the aim to determine a chemical formula of hydrated compound, which ingrains cupper, chloride and water molecules in its structure. In order to find this hydrated compound, it is necessary to use the law of multiple proportions. In other word, finding the appropriate variables values to this compound (CxCly*zH2O). Additionally, two major steps are required to proceed the experiment.
Two chemical reactions are carried by adding sodium hydroxide to the acidic solution from Part I. During the first reaction is the neutralization of the excess of nitric acid in the mixture by sodium hydroxide. The second reaction takes the place after naturalization is a complete and NaOH is in excess. While the liquid inside the beaker is being stirred, with the stirring rod, 10 ml of 6 M NaOH is poured into the solution from Part I at 1 mL at a time. After each 1 mL the solution is tested for acidity with red litmus paper.
This procedure occurred in the presence a Bunsen burner. The inoculation needle were placed within the open flame 15-20 second in order to sterilize the needle and prevent contamination. The needle was allowed to cool 5-10 second before inoculation. Using aseptic transfer technique the needle was used to gather up some of the colonies on the plate, making sure not to touch anything else with the needle. The test tube was uncapped and the lips of the test tube was passed through the open flame three times.