organic dye added to a solution that changes color base on the concentration of H3O ions in the solution. Each color change corresponds into a pH value. Common indicators used in the laboratory are methyl orange‚ methyl red‚ bromthymol blue‚ neutral red and phenolphthalein. In this experiment‚ methyl orange and phenolphthalein are used. To keep the pH within the narrow range we used a process called buffer system. It resists changes in pH using conjugate acid-base pair. In doing this‚ concept
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Protein Hydrolysis and Characterization Group 7 Niez‚ Robert Francis‚ *Orbin‚ Alfonso Ricardo* Parro‚ Athena Emmanuelle Peralta‚ Christian Department of Biological Sciences‚ University of Santo Tomas‚ Manila‚ Philippines • Abstract Hydrolyzed Protein is protein that has been hydrolyzed or broken down into its component amino acids. While there are many means of achieving this‚ two of the most common are prolonged boiling in a strong acid (acid-HVP) or strong base or using an enzyme such
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should happen is that the nitric acid and ammonia react with the aromatic ring and gives a coloured salt compound. When Nitric acid is heated with a protein like tyrosine it gives off a yellow colour ‚or tryptophan and orange colour this is down to nitration. This is why this test is used for the presence of an activated benzene ring. The “(4) Test for sulphur”this
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T2:BIOCHEMISTRY AND ANALYSIS:DETECTION OF FATS‚PROTEINS AND CARBOHYDRATES OBJECTIVE The main purpose of the experiment is to understand some general tests that detect fats‚proteins and carbohydrates in foods. INTRODUCTION Carbohydrates are also known as sacharides. There are 4 main groups of carbohydrates‚which are monosaccharides‚ disaccharides‚ oligosaccharides and polysaccharides. Carbohydrates play an important role in living organism as it is the energy storage‚ and it also plays
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the caffeine and benzoic acid in soft drinks. Introduction Soft drinks that commonly found in our daily life contain caffeine and sodium benzoate. The caffeine act as a stimulant and the sodium benzoate acts as a preservative of soft drink by inhibits grow of bacteria. In this experiment‚ hydrochloric acid is added to all solution to protonate the sodium benzoate to produce benzoic acid. Since the caffeine has no appreciable basicity‚ so it is neutral at pH 2. In this experiment‚ a spectrophotometric
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Title: Catalase enzyme detection Objective: To understand the function of catalase in cells that produce the enzyme‚ interpret the results of a catalase test and know their value in differentiating bacteria. Materials: 1 clean microscopic slide‚ 3% H2O2 solution‚ swabs. Micrococcus luteus‚ Enterococcus faecalis‚ patient G Procedure: 1) Scrape some cells off from each bateria to the slant and place them on glass slide. 2) Place one or two drops of H2O2. Watch for bubbling as an indication of
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the chemical compositions 2 - [(6 - deoxy - 2‚3‚4 - tri - O - methyl - α - L - mannopyranosyl)oxy] - 13 - [[5 - dimethylamino) - tetrahydro - 6 - methyl - 2H - pyran - 2 - yl]oxy] - 9 - ethyl - 2‚3‚3a‚5a‚5b‚6‚9‚10‚11‚ 12‚13‚14‚16a‚16b-tetradecahydro-14-methyl-1H-as-Indaceno[3‚2-d]oxacyclododecin-7‚ 15-dione and 2 - [(6 - deoxy - 2‚3‚4 - tri - O - methyl - α - L - mannopyranosyl)oxy] - 13 - [[5 - dimethylamino) - tetrahydro - 6 - methyl - 2H - pyran - 2 - yl] oxy] - 9 - ethyl - 2‚3‚3a‚5a‚5b‚6‚9‚10
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organic product of the following reaction sequence. 16 Answer: 39) What reagent is needed to complete the following transformation? Answer: 40) Provide a detailed‚ stepwise mechanism for the reaction of acetyl chloride with methanol to produce methyl acetate and HCl. Answer:
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TWS Chemistry 1013-231 Organic Chemistry I Name___________________________________ 2011 Exam#2 - Version 2 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Energy is __________ when bonds are formed and is __________ when bonds are broken; therefore‚ bond dissociation energies are always __________. A) consumed / released / endothermic B) consumed / released / isothermic C) released / consumed / endothermic D) consumed / released / exothermic
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INTRODUCTION: Carboxylic acids are organic acids characterized by the presence of a carboxyl group‚ -COOH. This acid acts as a weak acid‚ which can react with a strong base. Carboxylic acids form hydrogen bonds with many water molecules and are more soluble with one to four carbon atoms. Also‚ it may have an R group that consist of hydrogen or an alkyl group that changes its water solubility. Carboxylic acids with low molecular weight have odor at room temperature and higher molecular weight
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