affecting our joints and a weakness getting over the flu. Therefore‚ it is imperative that vitamin C concentrations can be quantified in what we consume and its presence in our bodies. Ascorbic acid can be analyzed using titration techniques with iodine‚ 2‚4-dinitrophyenylhydarzine‚ a redox indicator‚ or N-Bromosuccinimide (NBS)‚ but caution must be used with temperature because ascorbic acid in the oxidized form‚ dehydroascorbic acid‚ is unstable. Both forms are biologically active‚ but dehydroascorbic
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HOW DOES THE SOLUBILITY OF POTASSIUM CHLORIDE (KCL) AND POTASSIUM IODIDE (KI) IN WATER VARY WITH TEMPERATURE? AIM To observe solubilities of KCl and KI with water at different temperatures To compare the two solubility curves and discuss what might vary the solubility of different ionic compounds. THE VARIABLES DEPENDENT VARIABLE Temperature INDEPENDENT VARIABLE Amount of solute (KCl‚ KI) CONSTANTS Amount of the solvent (water)‚ pressure APPARATUS 100G OF POTASSIUM CHLORIDE 100G
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oxidized by iodine in acidic solution according to the following equation Ascorbic acid The standard method for determination of ascorbic acid involves the direct titration of acidified sample with a standard iodine solution. But the low solubility of iodine makes this procedure less than ideal. The proposed experiment avoids these difficulties is by using the reaction between iodide (in excess) and iodate which generate a known excess quantity of iodine‚ and this excess iodine is back
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for every trial. A 1% starch solution must be used in every test tube. Identical iodine solutions must be used to test the starch solution. The temperature of the warm bath water must be exactly 37 degrees C. Materials: Eyedropper Appoximately1 Liter of orange juice 25 test tubes One test subject for swishing the juice 25- 1% starch solutions (95 mL) Warm bath with water heated to 37 degrees C Iodine Stopwatch Litmus paper for pH testing Procedure: 1. Use an eye dropper to measure
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Modified Winkler method for dissolved oxygen determination Abstract In this study the group has determined the presence of oxygen in sample through a modified winkler method. The amount of oxygen is determined through a series of reaction. A body of water can sustain life if dissolved oxygen is sufficed. Depletions in dissolved oxygen can cause major shifts in the kinds of aquatic organisms found in water bodies. Introduction The amount of dissolved oxygen present in water or wastewater
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Solution by Iodometric Titration Results and Discussion Oxidation-reduction titration is a kind of volumetric analysis where the titrant used undergoes a redox reaction with the analyte. In this experiment‚ the oxidation of iodide (I-) to produce iodine (I2) is taken into consideration. The use of this concept in a redox titration is called iodometry. Iodimetry‚ on the other hand‚ deals with the reduction of I2 into I-. Between these two methods‚ iodometry is more popular because it is more efficient
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blocks of thyroid hormones. Iodine is then needed for formation of the hormones by its absorption from the diet and then carried via bloodstream to the thyroid gland which is then secreted into the colloid and oxidised into iodine ions. The attachment of iodine ions to tyrosine molecules triggers the pairing process performed by the thyroid peroxidise. This leads to production of thyroxine hormone T4 (containing four iodine ions) and triiodothyronine T3 (containing three iodine ions). (Martini 2004)
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Iodine clock reaction This is the hydrogen peroxide/ potassium iodide ‘clock’ reaction. A solution of hydrogen peroxide is mixed with one containing potassium iodide‚ starch and sodium thiosulfate. After a few seconds the colourless mixture suddenly turns dark blue. This is one of a number of reactions loosely called the iodine clock. It can be used as an introduction to experiments on rates / kinetics. 63 Lesson organisation This demonstration can be used at secondary level as an introduction
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Many advanced high school and college chemistry students perform an experiment known as the "iodine-clock" reaction‚ in which hydrogen peroxide reacts with iodide to form iodine‚ and the iodine subsequently reacts with thiosulfate ion until the thiosulfate has been consumed. At that point‚ the reaction solutions turn blue in the presence of starch. The experiment helps students understand the fundamentals of chemical kinetics --- the speeds at which reactions take place. 1. Activation Energy
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Active Ingredients Iodine 7% Potassium Iodide 5% alcohl 85% Purpose Antiseptic Uses To prevent infection in mior cuts‚ scrapes‚ and burns. Warnings For external use only Ask a doctor if you have: deep or puncture wounds animal bites serious burns. Stop use and consult a doctor if: The condition persists or gets worse‚ or if using for longer than once a week. When using this product: Do not use in the eyes. If contact occurs‚ flush with large amounts
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