It binds with starch so the more starch, the darker the solution was. We also used a blank solution with no starch to set the spectrometer to zero. The spectrometer was used to compare the absorbency of the starch in the control solutions and the non-control solutions over time. Amylase was the last solution added to start the initial breakdown of the starch. Adding it at one minute intervals allowed the students to see how much starch the amylase was actually breaking down over time.
Pg. 459 #1-12 all 1.Explain why a suspension is considered a heterogeneous mixture. A suspension is a heterogeneous mixture because the particles may remain mixed with the liquid while the liquid is being stirred, but later they settle to the bottom. 2.Classify the following mixtures as homogeneous or heterogeneous: a. lemon juice- can be either, because with pulp it is heterogeneous, and without pulp it is homogeneous. b. tap water-homogeneous c. blood-heterogeneous d. house paint-homogeneous 3.In a solution, which component is considered the solvent?
6) The ether was removed using the rotary evaporator. We discarded the used MGSO4 into solid waste containers. The solid that remained after ether evaporated was the neutral organic compound. 7) We scraped the solid from the flask with a spatula and allowed the solid to dry thoroughly on a piece of filter
A binding material can be separated by dissolving the tablet in ether since three active ingredients are soluble. Then, aqueous K2HPO4 and KOH are used to extract the ether solution with the conjugate base of the Aspirin layer and the conjugate base of the Acetaminophen, respectively. The caffeine can be isolated from the left over layer by evaporating the ether. Two separated solutions form solid by acidifying with HCl and the solid residue can be collected by vacuum filtration. According to the Revell's lab experiment, aspirin, acetaminophen, caffeine recoveries are 60% or higher, <10% and <5%, respectively.
Discussion & Conclusion In this experiment we learned how to synthesize the cyclohexene by dehydration of cyclohexanol. We procedure the first step where we have to mix the components. Then we heat the R.B.F with a fractionating column, distilled water. Then we obtained the layers, and we transferred the organic layer to a small, dry Erlenmeyer flask. We added anhydrous Sodium Sulfate as a drying agent.
Vegetable oil is hydrophobic and there for is not water soluble but alcohol on the other hand is completely soluble with vegetable oil. 3. We know from observing the vegetable oil and water together that the relative density of water is greater then the density of vegetable oil because the oil will always recede to the surface of water. 4. Emulsification agents allow for two unbendable liquids to be combined, the detergent hold properties that both substances can in return blend with leaving detergent dissolving in both the water as well as the alcohol unlike other substances we tried to
Lactase is effective at pH 2 – 7 (including dH2O) and therefore breaks down the lactose sugar in milk into glucose and galactose. As a result, the test strips will turn a shade of brown. . Lactase is not effective at pH 10 – 12. At the high pHs, the enzyme lactase is denatured and is no longer able to break down the sugar lactose in milk.
Results Sheet, Experiment 13 Brand of Vinegar used:________________ Acetic Acid % from bottle label_____________ | Initial NaOH Reading(estimate to 0.1 mL) | Final NaOH Reading(estimate to 0.1 mL) | Volume NaOH used(Final – Initial) | Trial 1 | 9.5 | 1.3 | 8.2 | Trial 2 | 9.6 | 1.4 | 8.2 | Trial 3 | 9.7 | 1.4 | 8.3 | Average Volume of NaOH used | 8.2 | Calculations: Normality of the acetic acid: .82 Mass of acetic acid: 49.2 % acetic acid (divide the grams, above, by the volume you used to get g/L): 4.92 Answer questions A-G in the lab manual: A. What is the average % acetic acid in your vinegar sample? Standard vinegar is 5% acetic acid. How does your result compare with the standard? The average was 4.92 which is pretty close comparably to the standard.
Samantha Monette Lab Section E Wednesday 10:00-12:50 p.m. Bromination/Debromination of Cholesterol Abstract: The purpose of this experiment was to purify commercial cholesterol. The commercial cholesterol was brominated using bromine as the reagent. After the compound was cooled and vacuum filtrated, dibromocholesterol was obtained. To purify the dibromocholesterol, zinc was added as the reagent. After a series of washes to remove any impurities, the compound was dried and decanted, cholesterol was synthesized.
StudyBlue Flashcard Printing of Lab Final 2211L UGA http://www.studyblue.com/servlet/printFlashcardDeck?deckId=... In the distillation experiment, the purpose of a fractionating column was to Which liquid would be most easily separated from water by simple distillation? 1. 1-propanol (bp=97 degrees C) 2. 2-propanol (bp=82 degrees C) 3. tetrahydofuran (bp=65 degrees C) 4.