reaction may also be known as the ‘Iodine Clock Reaction.’ 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
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oxidizing solution using the iodine/ thiosulphate titration where the reducing solution is potassium iodate solution and the oxidizing solution is sodium thiosulphate solution. Potassium iodate solution which is an oxidizing agent is added into an excess solution of acidified potassium iodide. This reaction will release iodine. Potassium iodide is acidified with sulphuric acid and the iodine released quickly titrated with sodium thiosulphate until it become light yellow. The iodine then detected with starch
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mass of ascorbic acid in the tablet. As iodine is a weak oxidizing agent used mainly for the determination of strong reducing agents‚ ascorbic acid C6H8O6 (aq) can be rapidly and quantitatively oxidized by iodine in acidic condition as shown in the following equation: I2(aq) + C6H8O6 (aq) → C6H6O6 (aq) + 2H+ (aq) + 2I- (aq) This method involves the direct titration of the ascorbic acid with a standard iodine solution in an acidic medium. However‚ iodine is not very soluble in water (0.001M)‚ this
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Determination of Chemical Formulae: The Reaction of Zinc and Iodine By Sarah Abstract: The main objective of this experiment was to use to the reaction between zinc and iodine to examine the validity of the Law of Conservation of Mass and the Law of Constant Composition. The Law of Constant Composition was tested by determining the mass of each of the reactants‚ zinc and iodine‚ and comparing their total to the mass of the zinc iodide product plus the excess zinc. The total mass of the reactants
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A reagent that is particularly good for the oxidation is an aqueous solution of iodine‚ I2. The brown iodine solution can be reduced by vitamin C (ascorbic acid) to form colourless iodide ions. However‚ I2 solution is not normally prepared directly by dissolving iodine in water because iodine is too volatile so it is almost impossible to avoid loss while the solution is being prepared. Therefore iodine is prepared in situ by mixing pure potassium iodate (KIO3 ) and potassium iodide (KI)
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Daiichi nuclear reactors in March 2011‚ a large quantity of radioactive caesium-137 and iodine-131 were released into the water supply. The Japanese government was accused of responding too slowly‚ and for not administering iodide prophylaxis to the exposed population. Iodine-131 is readily taken up by the thyroid gland‚ and the radioactivity can destroy the gland. However‚ this uptake of radioactive iodine can be blocked by giving iodide orally‚ thereby preventing hypothyroidism. The thyroid
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What is the Winkler Method? The Winkler Method is a technique used to measure dissolved oxygen in freshwater systems. Dissolved oxygen is used as an indicator of the health of a water body‚ where higher dissolved oxygen concentrations are correlated with high productivity and little pollution. This test is performed on-site‚ as delays between sample collection and testing may result in an alteration in oxygen content. How does the Winkler Method Work? The Winkler Method uses titration to determine
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Pos t-Lab Data Summary Note : some questions will display a variable like "nCount" or "SyInput" instead of an actual number in the data summary. Q# Question Text 5) Data Entry - No Scoring Enter the precise mass in GRAMS of the potassium iodate used to prepare your primary standard solution. Your mass precision should be reported to a thousandth of a gram‚ i.e. 0.302. (Use 3 significant figures.) Your Answer: 0.536 No Points Possible 6) Scoring Scheme: 3-3-2-1 If one had weighed out precisely
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thyroxine and accumulation of radioactive iodine in thyroid 2. Name the Independent Variable. thyroid activity 3. Name the Controlled Variables. gender‚ age 4. Why was RIA used to measure Thyroxine while IRMA was used to measure TSH? IRMA is more sensitive than an RIA and is needed to measure the small changes in TSH. 5. How was it used to observe relative amount of iodine accumulated by thyroid gland? Thyroid imaging was used to observe relative amount of iodine accumulated by thyroid gland Results
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|(15 marks) |Module 2: Lesson 4 ASSIGNMENT | | | | | |This Module 2: Lesson 4 Assignment is worth 15 marks. The value of each assignment and each question is stated in the left margin. | |(15 marks) |Lesson 4 Assignment:
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