E20-1 Experiment 20 Consumer Chemistry: Vitamin C in Fruit Juices The Task The goal of this experiment is to determine the concentration of vitamin C in a range of different fruit juices (fresh and preserved) using titration and to rank these sources of vitamin C. Skills At the end of the laboratory session you should be able to: * use a pipette correctly‚ * use a pipette filler safely‚ * manipulate a burette and carry out a quantitative titration properly‚ * weigh a sample
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Title: Determination of ascorbic acid content in vitamin C tablets EXPERIMENT 1 Name: Lim Jinq Chuan Class: CHM 151 Date: 04-09-2014 Matric number: J14015931 Title: Determination of ascorbic acid content in vitamin C tablets Aim: To determine the ascorbic acid content in vitamin C tablets. Procedure: Please refer to page (19-21) of the lab manual. Results: Experiment Volume of vitamin C Burette reading Volume of NBS (mL)
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Title: Analysis of the differences of percentage of vitamin C (ascorbic acid ) between the fresh orange juice and artificial orange juice (Sunkist). Problem statement : Does have different types of fruit juice contain similar amount of vitamin c ? Objevtive: To analyse the concentration and percentage of different food sample by using titration method and state whether the percentage and concentration of vitamin C. Methodology: Theory : DCPIP can also be used as an indicator for Vitamin
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today. The complete lack of vitamin C (ascorbic acid) characterized by dark purple spots on the skin and rotting gums‚ a disease called scurvy‚ took the lives of many sailors up until the mid 1800s when the prevention was discovered. Consequently‚ British sailors became referred to as ‘limeys’ because of their daily habit of eating limes to maintain their vitamin C levels. Citrus fruits and green plants synthesize a very high concentration of ascorbic acid‚ and other plants and most all animals
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solution and testing out some of the most basic people buy and love. Before this experiment can begin starch solution must be added to the beverages. As iodine is added‚ it will first react with the ascorbic acid in the beverage‚ producing a colorless product (dehydroascorbic acid). When the ascorbic acid runs out‚ the iodine will react with the starch in the beverage. At this poin‚ I will be able to recognize a highly visible color change. This color change is the end point of the reaction. Therefore
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Investigating Vitamin C Background Vitamin C is found in green vegetables‚ fruits‚ and potatoes. It is essential for a healthy diet. The chemical name for vitamin C is ascorbic acid. Ascorbic acid is a good reducing agent and therefore it is easily oxidised. Methods for the detection of vitamin C involve titrating it against a solution of an oxidising agent. Where to start There are several oxidising agents that can be used and a commonly used one is 2‚6-dichlorophenol-indophenol or DCPIP
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cosmetic company due to its antioxidant properties. In the terms of its production‚ the fact that vitamin C has two totally and distinctly separate sides is still unknown to many people even doctors. The two sides consist of "L"-Ascorbic Acid‚ which is the (-) side‚ and DAscorbic Acid‚ which is the (+) side. The L side of Vitamin C is the active side‚ and is the side which is beneficial to mankind. The D-side of Vitamin C is designated as useless and discarded by the body‚ as most research shows. People
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water-soluble and is an enantiomer of ascorbic acid. (Commercial vitamin C is often a mixture of ascorbic acid and other ascorbates.) Ascorbic acid‚ C6H8O6‚ is a reducing agent that reacts rapidly with iodine (I2). As the iodine is added during the titration‚ the ascorbic acid is oxidized to dehydroascorbic acid‚ while the iodine is reduced to iodide ions as shown in the following equation: (studymode.js‚ 2010). Ascorbic acid + I2 (aq) -----------> 2I- (aq) + dehydroascorbic acid Due to this reaction‚
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Determination of Ascorbic Acid in Vitamin C Tablets Done by: lora ID #: Date:12/3/2011 Objectives: The aim of this experiment is to determine the weight of ascorbic acid in three vitamin C tablets by titrating it directly with KBrO3‚ then back titration by Na2S2O3. Introduction: Vitamin C is a weak acid and a water soluble substance and it is often called ascorbic acid. It is useful for many biological activities and main functions such as: it is used to provide reducing equivalents for biochemical
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CHEMISTRY 221 LABORATORY�QUANTITATIVE ANALYSIS EXPERIMENT: DETERMINATION OF ASCORBIC ACID IN VITAMIN C TABLETS THEORY: Ascorbic acid‚ C6H8O6‚ MM = 176.13‚ can be oxidized to form dehydroascorbic acid by bromine via the following reaction: The bromine or iodine used in the titration is generated by adding an excess amount of KBr or KI to an acidified solution of the sample according to the following reaction: BrO3- + 5 Br- + 6 H+ 3 Br2 + 3 H2O IO3- + 5 I- + 6 H+
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