Approximately 2 gm, nearest to 0.1 mg, oven dried cornhusk fibres, were weighed out accurately in weighing bottle and transferred to a 100 ml beaker. 40 ml of cold (10-15˚C) 72% sulphuric acid was added gradually to the fibres in small increments while stirring the mixture and macerating the fibres with a small glass rod. The beaker was kept in a bath at 2 ± 1˚C for dispersion of material. After the specimen was dispersed, beaker was covered with a watch glass and kept in a bath at 20 ± 1˚C for 2 hours. Mixture was stirred frequently to ensure complete
This product has a size of 15.2 length*5.5 width*1.5 height cm and no battery required. 4moms, Spout Cover, White-http://amzn.to/2sIDiUF Summer Infant Turtle Digital Temp Tester- http://amzn.to/2CyL7vG Summer infant temperature tester shows water temperature in three different colors red water is too hot, yellow too cold, green right temperature. The product recalculates temperature after every 10 seconds and features 1o minutes auto shut off to preserve battery life. The product dimension is 6.3 x 3.7 x 0.9 inches. It supports both Celsius and Fahrenheit reading
Burette can actually transfers water more accurate compare to pipette and micropipette. The burette calibration were done using 5ml, 10ml, 15ml, 20ml and 25ml of water. Each volume of water was repeated three times to obtain a more accurate result. When the experiment is conducted, the mass of the empty Erlenmeyer flask is taken before each trial. For the nominal water volume of 5ml, apparent mass of water for Trial 1, Trial 2 and Trial 3 are 5.064g, 4.976g and 4.945g respectively.
As it was done in the Experiment A, 20 drops of 0.2 M acetic acid and 10 drops of 2% starch solution was mixed well with the juice solution. Before adding the iodine solution, the initial reading of the burette was taken. Then, the titration was started using the iodine solution into the burette with continuous swirling of the flask slowly and carefully. Once the color change started to appear, titration was stopped and final burette reading was recorded. Finally, the amount of vitamin C in the mandarin orange was calculated by using the standardization factor and used iodine solution.
21 Fresh semen samples were diluted with phosphate-buffered saline (PBS) to 2x106 sperm/mL. Fifty µL were incubated with 100 µL lysing reagent for 15 seconds and then 2 mL of PI was added and mixed with tube. Tube acquisition was done by flowcytometry immediately after staining. The intensity of its emission corresponds to the DNA content. Flowcytometric analysis displays a constant and characteristic bimodal nonartifactual DNA pattern indicating the presence of two different populations.
In a typical process, appropriate amounts of SO dye and the catalysts were first mixed in a small amount of distilled water. Then, a certain volume of NaBH4 solution was introduced into the above system to form a 3 mL solution. Here, the concentrations of the SO dye, NaBH4 and the catalyst were 2×10-5 mol L-1, 40 mmol L-1 and 200 mg L-1, respectively. Firstly, the catalytic degradation of SO dye in the absence of Bi2S3 NSs by NaBH4 was studied. A small amount of SO dye was degraded.
After deciding on what algae concentration we wanted to hold constant in our jars, we calculated the volume of seawater and algae solution required to achieve the desired algae concentration of 50,000 cells/mL and a total volume of 50 mL (C1V1=C2V2). We measured out the required volume of seawater with a graduated cylinder, pouring the contents into each jar. Because our calculated seawater volume was not a whole number, we utilized a micropipette to transfer the remaining amount of seawater. We then proceeded to collect algae from the large flask after carefully swirling around the algae to evenly distribute it within the water (Flipped Lab Videos 2016a). Using the micropipette, we transferred the appropriate volume of algae to the jars.
Decomposition of Aspirin Studied with UV/Visible Absorption Spectroscopy Aims: To determine the concentration of salicylic acid, formed from the hydrolysis of Aspirin, at regular intervals using the UV/Visible Absorption Spectroscopy From the concentration of salicylic acid, concentration of Aspirin to be determined using an equation Calculate the rate constant of this reaction and its order from a plot of graph of ln(aspirin) vs time Discuss the overall flaws and improvements to the experiment Results: As per schedule1, 0.212g of aspirin was added to 50 ml boiling water to form salicylic acid in a 100 ml flask, of which 1 ml was then pipetted to a 50 ml volumetric flask at the 5th min. Following an ice bath, the solution was mixed
Standardization of NaOH solution Accurately weigh out a sample of approximately 0.3-0.4 g of primary standard potassium hydrogen phthalate, KHPh, which has been previously dried at 120°C. Do not use more than 0.4 g. To obtain an accurate mass, weigh the sample on weighing paper, slide it into a clean (but not necessarily dry) 250 mL Erlenmeyer flask and reweigh the paper to account for any KHPh that may remain on it. Dissolve the KHPh sample in about 50 mL of CO2-free water and add 2-3 drops of 0.1% phenolphthalein indicator. Begin adding the approximately 0.1 M sodium hydroxide solution from the buret while continuously swirling the flask contents. Do not open the stopcock completely.