Kool-Aid Abstract Tetramethylammonium iodide was dissolved in a mixture of of Iodine and 95% ethanol while gently heated in a fume hood. Once cooled‚ crystals started to form in the beaker‚ which were then collected and washed with hexane through a series of processes involving vacuum filtration. Then a mixture of 5mh of the crystals and 5ml of 95% ethanol was created and tested on a slice of potato to analyse the iodine content. After‚ with sodium thiosulphate in the buret‚ the iodide solution was
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2012 9701/36/O/N/12 3 1 You are to determine the concentration of aqueous copper(II) sulfate by titration. The concentration of Cu2+ ions in a solution can be found by reaction with an excess of aqueous iodide ions to produce iodine. The amount of iodine formed can be found by titration with thiosulfate ions‚ S2O32–. For Examiner’s Use FB 1 is aqueous copper(II) sulfate‚ CuSO4. FB 2 is 0.100 mol dm–3 sodium thiosulfate‚ Na2S2O3. FB 3 is aqueous potassium iodide‚ KI. starch indicator
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Project Report - Determination of the Dosage of Bleaching Powder Required for Sterilization of Different Samples of Water CONTENTS 1. INTRODUCTION 2. GENERAL METHODS USED 3. THEORY 4. REQUIREMENTS 5. PROCEDURE 6. OBSERVATION TABLES 7. CALCULATIONS 8. RESULT 9. CONCLUSION INTRODUCTION Water is the major constituent of all living beings. Water necessary to sustain all types of life. The water used for drinking purpose by human beings should full the following
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position of equilibrium lies to the left hand side. * When a reaction reaches equilibrium‚ it is impossible to tell whether the reaction has started with the reactants or the products. * For example‚ if you react equal amounts of Hydrogen and Iodine to form Hydrogen Iodide (left)‚ you will end up with the same amount of reactants and products if you had decomposed Hydrogen Iodide (right). Shifting the Position of equilibrium * The position of equilibrium can be altered by changing:
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in the bleach of the rival industry and improve it. Hypothesis: The hypothesis is that‚ an accurate determination of NaClO in commercial bleach can be done. By mixing the acidified iodide ion to the hypochlorite solution‚ the iodide is oxidized to iodine which forms complex triiodide ions that give the red-brown color to the solution. Because the endpoint of the titration of triiodide is hard to determine‚ starch is added to give the solution a dark blue color. If starch was not added‚ the color would
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the iodine produced from potassium iodide by manganese(III) hydroxide. 2Mn(OH)3(s) + 2I-(aq) + 6 H+(aq) －－＞ 2Mn2+(aq) + I2(aq) + 6H2O(l) Sodium thiosulphate is used as the titrant. Success of the method is critically dependent upon the manner in which the sample is manipulated. At all stages‚ every method must be made to assure that oxygen is neither introduced to nor lost from the sample. Furthermore‚ the sample must be free of any solutes that will oxidize iodide or reduce iodine. Chemicals:
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REACTION: IODIMETRIC AND IODOMETRIC METHOD SUBSTANCE TO BE ASSAY AQUEOUS/NON-AQUEOUS ALKALINITY / ACIDIMETRY DIRECT/RESIDUAL TITRATION TITRANT INDICATOR CHEMICAL REACTION Assay of Antimony potassium tartrate Direct titration 0.1 N Iodine Starch TS KOOCCHOHCHOHCOO (SbO) + I2 + H2O KOOCCHOHCHOHCOO (SbO2) + 2HI + 2HI + 2NaHCO3 2NaI + 2H2O +
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creating a foam “snake” which quickly fills the cylinder and spills onto the large serving tray. Since this is an exothermic reaction‚ steam may be seen emerging from the cylinder. The possible presence of a brown color in the foam is evidence of iodine in the reaction vessel. Hazards: Care should be taken handling 30% hydrogen peroxide – it is severely corrosive to the skin‚ eyes and respiratory tract. Do not stand over the reaction – steam and
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(10 points) Reactants Prediction of Reaction Type Observations Reaction Type iron and copper (ll) Sulfate Single Replacement reaction The chemicals seem to layer Single Replacement Reaction Lead (ll) Nitrate and Potassium iodine solution Double Replacement reaction The Solution changed colors Double Replacement Magnesium metal and
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What’s an Investigatory Project Exactly? An investigatory project is basically any science experiment where you start with an issue or problem and conduct research or an investigation to decide what you think the outcome will be. After you’ve created your hypothesis or proposal‚ you can conduct a controlled experiment using the scientific method to arrive at a conclusion. What Kind of Investigatory Projects Are There? In order to conduct a great investigatory experiment‚ you have to ask an interesting
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