Vacuum flask

1-Octadecene (45 mL) was injected as a noncoordinating solvent into the flask at 150 °C and heated to 310 °C under N2 environment, yielding a clear solution of Cd(OA)2 and Zn(OA)2. At the elevated temperature of 300 °C, 0.6 mmol of Se and 12 mmol of S dissolved in 12 mL trioctylphosphine (TOP) was injected into the vessel containing…

The solid was then isolated through vacuum filtration, resulting in pale yellow-white powder. Next, acetone was used to dissolve the powered. This solution, a slightly cloudy yellow liquid, was then centrifuge, resulting in a clear yellow solution with solid impurities. The purified solution…

The mixture was filtered and rinsed with cold ethanol and cold water to remove its brown color and a crude weight was taken (0.238 g, 0.936 mmol) The resulting solid was placed into a 25-mL round bottomed flask along with maleic anhydride (0.245 g, 2.50 mmol) and triglyme (4 mL). Then, the flask was fitted with a reflux condenser and refluxed in a sand bath for 5 min. The soln was cooled and had ethanol (2mL) and sodium hydroxide (6 mL) added. The resulting mixture was filtered and the solid was…

and 20 mL distilled water and stirred for 15 min at room temperature. Then, the solution B was drop-wise added into the solution A. The resultant mixture was stirred for 45 min with high speed disperser (7500 rpm) than transferred in an Erlenmeyer flask and heated at 85 °C in an oven for 24 h until a transparent sol was obtained. The obtained sample was then washed several times with distilled water and dried at 100 ºC for 12 h. Finally, the samples were calcined for 3 h at the following…

Scientific, Nottingham, UK). NGI setup comprises of a stainless steel induction port attached with a mouthpiece adaptor, eight removable stainless steel collection cups located at seven plus a micro orifice collector (MOC) stages, a high capacity vacuum pump (Model HCP5), and a critical flow controller (TPK 2000). Before each run, the NGI collection cups were coated with silicone oil to minimize the particle entrainment after deposition. The air flow rate (Q) was tested and tuned at 100 L/min…

Panesar (1987), and Hecker et al. (1990) had begun endeavors to develop more efficient alkali and sulfite processes. This was done by attempted by sparging with CO2 (the bubbling of inert gases in the liquid to remove dissolved gases) or installing a vacuum in the fermenter to control aeration. This method resulted in a 40% glycerol yield efficiency at concentrations of 230 g/L. (Kalle, 1985; Vikar and Panesar, 1987). A fed-batch and continuous version of this reactor was also used, however…

Discussion of Results During the first week the goal was to determine the unknown compound. In order to determine the unknown compound, many tests were performed testing the solubility, pH level, conductivity, cations present (flame test), and the anions present in the compound. The anion test had positive results for the sulfate test due to the formation of a white precipitate, indicating the presence of a sulfate ion. For the sulfate test the unknown solution, potassium sulfate, and combining…

fashion and pop culture truly making the decade exuberant and fast wheeling. The 1920s were a time of technological innovation. New and improved appliances materialized and gained acclamation throughout the United States. Electric refrigerators, vacuum cleaners and washing machines made housework time efficient and easy. The increase in efficiency…

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,…

When calculating the quantitative solubility of the unknown compound in water, the amount of water that was measured in the hydrated cylinder and poured into the flask could have been greater than expected. This is more likely than less water being used because more solute was needed to saturate the solution than expected. Another error that could have occurred during this part of the experiment was that too much…