Analysis of Commercial Vitamin C Tablets Aim: To employ iodometric titration to determine the content of vitamin C in commercial tablets using volumetric analysis and compares it with the manufacturersÂ’ specifications. Introduction Vitamin C is an essential substance for maintaining good health and it is proved to be the agent which prevents scurvy. Most animals can synthesize their own vitamin C‚ but some‚ such as human cannot. Owing to the increasing concern for oneÂ’s health
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Date: 25 Nov‚ 2004 Objective: 1. To standardize sodium thiosulphate for titration use. 2. To find out the concentration of Vitamin C in the tablet. Theory: This experiment involves titration of redox reaction. Redox reaction means reduction and oxidation. In which oxidizing agent and reducing agent are mixed and oxidize/reduce each other. One losses electron(s) and increase in oxidation number when is oxidized‚ and vice versa. In order to find out concentration of the ascorbic acid in the tablet
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iodate(KI) and dilute sulphuric acis(H2SO4) react to find out the excess quantity of iodine. Below shows the equation. second Second‚ the iodine generated reacts with ascorbic acid immediately. While the excess iodine is the titrated by standardized sodium thisulphate(Na2S2O3) as shown the equation below. Then‚ the iodine reacted with ascorbic acid can be determined followed by the content of ascorbic acid. third Starch indicator is added for the determination of the end point of the titration
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EXPERIMENT 5 REDOX TITRATION: TITRATION USING SODIUM THIOSULPHATE Objectives 1. 2. To prepare a standard solution of potassium iodate for use to determine the concentration of sodium thiosulphate solution accurately. To acquire the proper techniques of carrying out a titration. Introduction Redox titrations using sodium thiosulphate as a reducing agent is known as iodometric titration since it is used specifically to titrate iodine. The reaction involved is: I2 + 2Na2S2O3 I2 + 2S2O322NaI + Na2S4O6
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immediately reduced to iodide as long as there is any ascorbic acid present. The amount of ascorbic acid is determined by the stoichiometry of the equations and the difference between the total amount of iodine present and the amount that reacts with the thiosulphate. This method is suitable for use with vitamin C tablets‚ fresh or packaged fruit juices and solid fruits and vegetables. INTRODUCTION Vitamins are a group of small molecular compounds that are essential nutrients in many multi-cellular organisms
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remain the same after adding H2SO4 to the solution (colourless) Colour of KIO3 and H2SO=colourless Colour of the solution after adding 0.2MKI on KIO3 and H2SO is dark yellow brown (dark red colour appeared) After titrating standardized 0.1M sodium thiosulphate colour of iodine changed from yellow brown to pale yellow Colour change after adding indicator (starch) to the solution is blue (dark brown colour appears On adding Na2S@O3 colour changes to pale yellow Reactions: KIO3 (aq) + 5KI (aq) +
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following equation: IO3-(aq) + 5 I- (aq) + 6 H+ (aq) 3I2 (aq) + 3H2O (l) Then the experiment is immediately followed by a back titration of the excess liberated iodine with standard sodium thiosulphate solution as shown below: I2 (aq) + 2S2O32- (aq) → 2I- (aq) + S4O62- (aq) With iodine solution‚ the thiosulphate ion is oxidized quantitatively to tetrathionate ion. The amount of iodine solution produced using this method can then be calculated. The above method have to be repeated for two times
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Rates of reaction Sodium Thiosulphate and Hydrochloric Acid An experiment was carried out to investigate the effect of temperature on the rate of reaction between sodium thiosulphate and hydrochloric acid. The equation for this reaction is shown below. Method (1) A measuring cylinder was used to measure 50cm3 of 0.08M sodium thiosulphate solution into a test tube. A bung was placed in the test tube. (2) A pipette was used to measure 5cm3 of 1.0M hydrochloric acid and this was placed into a second
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’ The rate of the reaction will be measured by timing the reaction between Hydrogen Peroxide‚ Potassium iodide‚ and Sodium Thiosulphate. Sodium Thiosulphate is used as a delaying mechanism as the reaction between the two main reactants is too rapid to measure. The Sodium Thiosulphate will react with the Iodine [III] ions (the product) first and when the all the Sodium Thiosulphate has reacted‚ then the remaining Iodine ions will form a blue-black solution because of the addition of Starch into the
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of bleach’s stored at different temperatures. Introduction: Chlorine bleaches are made by dissolving chlorine in sodium hydroxide solution. They have a number of uses as they are used to remove colors‚ whiten or disinfectant via oxidation. Many bleaches have strong bactericidal properties‚ and are used for disinfecting and sterilizing as they contain chlorate ions. Sodium Thiosulphate is used in the pH testing of bleach substances as it neutralizes the color-removing effect of the bleach and makes
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