We then slowly added 25ml of chilled deionised water to the filtrate to initiate crystallization by using a measuring cylinder and a dropping pipette, once we had done this we left it for about 10 minutes to allow crystallization at room temperature. We then weighed a filter paper which we will use later in the experiment. We then collected the crystallized acetylsalicylic acid by vacuum filtration in a Buchner funnel and washed the product with a little ice-cold water. We then pre-weighed a clean, empty watch glass and labelled it with our initials and the date, we did this do we could easily identify that it was ours when we go to weigh it with the crystals on. We
Table 3: Uses of sodium lauryl sulfate. Use Concentration (%) Anionic emulsifier, forms self-emulsifying bases with fatty alcohols 0.5–2.5 Detergent in medicated shampoos ≈10 Skin cleanser in topical applications 1 Solubilizer in concentrations greater than critical micelle concentration >0.0025 Tablet lubricant 1.0–2.0 Wetting agent in dentrifices 1.0–2.0 It is a detergent and wetting agent effective in both alkaline and acidic conditions. Description: Sodium lauryl sulfate consists of white or cream to pale yellow-colored crystals, flakes, or powder having a smooth feel, a soapy, bitter taste, and a faint odor of fatty substances. Typical Properties: • Acidity / alkalinity : pH = 7.0–9.5 (1% w/v aqueous solution) • Acid value : 0 • Antimicrobial activity : Sodium lauryl sulfate has some bacteriostatic action against Gram-positive bacteria but is ineffective against many Gram-negative microorganisms. It potentiates the fungicidal activity of certain substances such as sulfanilamide and sulfathiazole.
Hence, a calcium chloride and cotton were filled inside a drying tube. The condenser was wrapped with parafilm and a paper towel to avoid moistures from entering. The reagent will act as nucleophilic addition to acetone and work up with hydrochloride acid to synthesize 2-methylhexanol. Throughout this process, the solution turns dark grey and develop white precipitates. This step indicate that Grignard reagent was generated, and the extra white precipitates were magnesium.
Carbon dioxide and water in the solution were also clear. Once the solution was completely titrated, Mn7+ ions remained unreduced and changed the color of the solution to pink. The KMnO4 was added to each solution until the oxalate solution reached the end point and changed to an extremely light pink color. The change in volume in the burette of the potassium permanganate recorded in all three trials was used to calculate the moles of oxalate in the 0.100-gram compound, giving the percent composition of the compound. The three trials reacted 27.95 mL, 26.61 mL, and 25.74 mL of potassium permanganate to determine 55.7%, 53.0%, and 51.3% respectively of oxalate in the compound with a 53.3% average.
A spin vane was added and a water-jacked condenser was attached. Isopentyl nitrite (0.06ml, 0.045 mmol) was dissolved in 1,2-dimethoxyethane (0.50 ml) in a 3-ml conical vial and caped to prevent loss by evaporation. Running the reaction. The mixture in the 5-ml conical vial containing the tetraphenylcyclopentadienone and anthranilic acid was heated on an aluminum block to 140° C. Once the mixture started to boil the prepared mixture of isopentyl nitrite was added to the 5-ml conical vial through the top of the condenser using a pasture pipette. The solution continued to boil for 25 more minutes until a
In this lab, two different titrations were performed with three different antacids to determine which brand is the most effective at the cheapest price. The antacids were ground up separately and approximately 0.2 grams of it was placed in a flask. Methyl Orange, an indicator, and a stir bar were added into the flask. The flask was then put on a stir plate which was under a buret with 0.1M hydrochloric acid. The acid was poured into the flask until there was a permanent pink colour.
Add deionized water to the volumetric flask to the 250ml mark on the volumetric flask. 13. Read the volume from the bottom of the meniscus. 14. Swirl the solution to ensure that the oxalic acid crystals are properly dissolved in the deionised water.
What I have done are Hypotheses paragraph, introduction, conclusion, (not provided this time) and experiment. The following words are used to explain my experiment in detail. 1. Equipment High Temperature Tube Furnace, alumina crucible, heat-proof gloves, 250 mL Erlenmeyer flask, condenser, 250 mL beaker, 50 mL beaker, 100 mL beaker, Buchner funnel, Buchner flask, pH paper, crystallizing dish, thermometer, feeder funnel 2. Materials Urea, Oxalic acid, Y(NO3)3‧6H2O, Cu(NO3)2‧3H2O, Ba(NO3)2, 95% C2H5OH 3.
Use the following criteria for the preparing of arrange of dilutions in the agar: On the base of steriled petri dish,label each of the concentrations required then place 1ml of the dilutions in water each of them in the labeled dishes after preparing them with the addition of one ml watter in control plate; 19ml pipette containing melted agar is cooled and then added to each plate and mixed together adequately and this mixing is an essential matter. Plates should be dried well after setting them carefully and the lids must be tiped for 20-30 mins.at 37C in the incubator, as the plates inoculated this is done by two methods either as multiple spots of inoculator or by using a platinum or wire loop which is designed for deilevery of 0.001ml over asmall area; the culture shall be diluted in either cases and contains 105to106 organismsml and this is obtained by the addition of 5µl broth culture overnight to 5ml peptone water. Electrolyte deficient and selective media should not be used to avoid giving false results due to the variable effects in the content of the salt on many antibiotic actions. Translation of the results
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