Erlenmeyer flask

Vitamins are a small group of small molecular compounds that are vital in multi-cellular organisms; particularly humans. Ascorbic acid, which is commonly known as vitamin C is naturally present in some foods, added to others, and available as a dietary supplement. Vitamin C is an antioxidant and a lack of vitamin C can result in variety of illnesses. A common illness from a lack of ascorbic acid is; scurvy. Scurvy causes edema of the gums, exhaustion, and sometimes ulcerations of the gums.…

OBJECTIVE: The purpose of this lab is to determine the percentage yield of the reaction between sodium bicarbonate and acetic acid. INTRODUCTION This lab demonstrates the double replacement / acid-base neutralization reaction between the reactants of two household cooking items, baking soda and vinegar, producing carbon dioxide, water, and sodium acetate. Baking soda is an odorless, powdered chemical compound called sodium bicarbonate (NaHCOз). NaHCOз is most commonly used in baking as a…

medium was inoculated into 250 ml Erlenmeyer flask containing 100 µl (107cells/ml) of bacterial suspension with HM (mg L-1): Fe (150), Mn (100), Ni (50), Cd (30), Cu (30) and Zn (50) with pH adjusted to 4, 6.5 and 9. Another set of experiments were set up by inoculating SE medium containing HMs (mg L-1 ): Cr+6 (100, 150, 200), Fe (100, 150, 200), Ni (50, 100, 150), Cu (30, 60, 90), Zn (50, 100 , 150), Mn (50, 100, 150), Cd (30, 60, 90) with pH adjusted to 7. All flasks were incubated in a rotary…

ethanol 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…

25.0 ml of 2-methylcyclohexanol in a 100-ml round bottom flask and to this 10 ml of 9 M sulfuric acid is added which acts a catalyst to this reaction. The content is swirled is completely for about 2 minutes periodically. Then 3 boiling chips is added to the mixture, now starts the fraction distillation. The mixture is heated with a heating mantle for distillation to occur. It is heated until 10-ml of the mixture remains in the reaction flask or less than 100°C. The organic liquid obtained is…

mixture of 5.0 mL concentrated nitric acid and 5.0 mL concentrated sulfuric acid was prepared in a 100-mL Erlenmeyer flask and was placed into a water bath to cool to room temperature. 3.93 grams of bromobenzene was added to the solution over a period of 10 minutes with constant mixing. After all of the bromobenzene is added, the mixture was heated with a hot water bath for 30 minutes. The flask was cooled to room temperature and then poured into 50 mL of ice-cold water in a 200 mL beaker. The…

the tardigrades I will follow the procedure detailed by McNuff. To do this, 150 mL Chalkey’s Medium (which I will mix myself from chemicals available in the chemistry department) and soil extract, will be placed in an Erlenmeyer flask prior to inoculation with the specimens. The flask will be covered with parafilm. I will place them in a shaded area of around 10-20°C. For a food source I will use Chlorococcum hypnosum,…

This happened to be a clear oily substance on the bottom of the Erlenmeyer flask, which could easily go unnoticed. Another thing that is provided by the results is an IR spectrum, which when analyzed it revealed that the functional groups present in the final product, 2-methylcyclohexanol, was indeed produced. The way that…

repeatedly added to the potassium iodide starch test. Once the paper no longer turns blue-black the reaction is considered complete. Potassium iodide starch test paper is a paper strip use to determine if excess sodium hypochlorite remains in the flask. A diethyl extraction was used to remove the lower aqueous layer of the product after the potassium iodide starch test. This removes unreacted diol and leftover acids. Later an aqueous extraction method is using to remove the organic ether layer,…

Experiment 1 and 2 Recrystallization: Purification of Solids and Melting points Purpose: In the fist experiment, impure Vanillin was purified through the process of recrystallization. Desired solutes were recovered through the technique of vacuum filtration, and then dried to take percent recovery In the second experiment, a percent recovery of the recrystallized Vanillin from the first experiment was performed. The percent recovery of Vanillin was 77.18% A mixed…