Erlenmeyer flask

cylinder, Erlenmeyer flask, and beaker were used to measure a 60-mL volume. Which of these devices seems to be the most accurate for measuring a 60-mL volume? Be sure to explain what the term ‘accurate’ means. How did you determine this during lab? State some reasons why this device might be most accurate compared to the others. The graduate cylinder seemed to be the most accurate for measuring a 6-mL volume, as one is able to approximately reach the true value better than using an…

Chromatography Abstract: The purpose of this lab is to use chromatography to separate and purify organic compounds. There are many different types of chromatography but most depend on the principle of adsorption. The two important components of chromatography are the adsorbent and the eluent. Adsorbents are usually solid materials that will attract and adsorb the materials to be separated. The eluent is the solvent, which carries the materials to be separated through the adsorbent. After being…

salicylic acid. With excess acetic anhydride and a concentrated acid, 0.510 g of salicylic acid should have yielded approximately 0.665 g of acetylsalicylic acid. Unfortunately, small quantities of the reagents and products adhered to the sides of the flask and filter paper during the experimental process. In the end, an actual yield of 0.524 g resulted from the experimental procedures. This quantity equated to a 78.8 % yield. The purity of both the salicylic acid used and the…

Then we added 20 mL of DW to the flask and put it into a water bath. We used the stirring rod to stir the mixture up for completely dissolved. If the sample did not dissolve, we put more DW drop by drop using the dropper. When the sample was fully dissolved, we gently put the flask into an ice bath and wait until it recrystallized. We noticed not to move the sample around or it would break the crystals inside…

Effect of Temperature and Substrate Concentration on Catalase Reactions Blake Devivo Biol 101 Lab February 10, 2016 Abstract The human body contains thousands of tiny structures called enzymes that perform specific functions. One enzyme called “Catalase” is often used to regulate the amount of a toxic compound, hydrogen peroxide, in the body. The purpose of this experiment was find the different factors that can affect Catalase-Peroxide reactions. The first part of this experiment…

For acetic acid-sodium hydroxide titration, 10ml of distilled water was added to 250ml Erlenmeyer flask. 20ml of diluted acetic acid was pipetted into that 250ml Erlenmeyer flask. Titration system that contained 0.100M NaOH in the burette was set up. The pH meter was used to monitor pH of the system when sodium hydroxide was being added. NaOH was added in an increment of 1ml until…

sufficiently concentrated (almost 0.2 mL), add deoxygenated diethyl ether dropwise until precipitation occurs. Cool the flask in an ice bath and collect the light yellow crystals by filtration. Calculate the percent yield and obtain the IR spectrum7. Assign the peaks in the infrared spectrum. Then record the identifyinh NMR peaks found through NMR…

Introduction In this weeks lab each group is assigned an unknown alcohol and an unknown carboxylic acid for testing. Each group then synthesizes an unknown ester from a Fisher Esterification reaction of the given unknown. Once an ester product is obtained, 1H and 13C NMR, boiling point, and smell testes are run on the final product in order to identify all the given unknowns. Procedures The first step of this week’s lab was to mix 3mL of the unknown alcohol and 6mL of the unknown carboxylic…

used to measure the effect of a change in volume on the pressure of a gas, and to obtain various data points that were used to measure 4 values for a Boyle’s Law constant. In part B, a setup with a water bath, and a rubber stopper assembly in an Erlenmeyer flask was used to measure the change in pressure of a gas when temperature was changed, and to obtain 4 values for a Gay-Lussac’s Law constant. These sets of four values were averaged to provide 2 average constants, which were used to measure…

extraction. In this experiment, 7 ml of the mixture was used instead of 10 ml. A portion of this mixture was transferred to another flask to facilitate cooling. Afterwards, 3.5 ml of 12 M hydrochloric acid was added gradually to the mixture. A sample was obtained at a melting point of 1250C, and another at 750C. A sample of this mixture was then transferred to a 50 ml volumetric flask. Finally, a crystal was formed and the melting point of the sample was obtained as 62 0C. A Flowchart…