the effect of varying the concentration of iodide ions on the rate of reaction between hydrogen peroxide and an acidified solution of potassium iodide: H2O2(aq) + 2H+(aq) + 2I⁻ → 2H2O(l) + I2(aq) The course of this reaction can be followed by carrying it out in the presence of small quantities of starch and sodium thiosulfate solutions. As the iodine molecules are produced they immediately react with the thiosulfate ions and are converted back to iodide ions: I2(aq) + 2S2O32⁻(aq) → 2I⁻(aq) + S4O62⁻(aq)
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Chemistry Lab Report (Design) Factors affecting Rates of a Reaction (Kinetics) KINETICS DESIGN LAB Research Question: Does the concentration of Potassium Iodide (KI) affect the rate of its reaction with hydrogen peroxide (H2O2) (of a fixed concentration)? Introduction: There are several factors that affect the rate of a reaction. Some of them being Pressure (if the reactants are Gases)‚ Temperature‚ Presence of a Catalyst‚ Surface Area of the reactant‚ and Concentration. According to
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Peroxide by Potassium Iodide Brief Description: Two solutions are mixed resulting in an eruption of foam resembling a huge stream of toothpaste. This is the classic “Elephant Toothpaste” reaction. Purpose/Goal: Procedure presents an example of a catalyzed reaction. Explanation of Experiment: The rapid evolution of oxygen gas is produced by the following reaction: 2 H2O2 (aq) = 2 H2O (l) + O2 (g) + heat The decomposition of hydrogen peroxide in the presence of iodide ion occurs in two
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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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teachers and science demonstrators are specially trained in the hazards of using these chemicals. * Hydrogen peroxide (30%) - This is ten times stronger than the normal hydrogen peroxide you can find at the store * Sodium iodide solution‚ 2 M or * Potassium iodide solution‚ 2 M * Liquid soap * Food coloring * Graduated cylinder (500 mL) * Safety glasses * Rubber gloves for clean-up * Experiment * Video * Related Experiments * Reviews Magic Spheres - Science
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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 solution and it turn into dark blue solution and titrated
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though there is no visible reaction initially. Shortly thereafter‚ the liquid suddenly turns to a shade of dark blue. This clock reaction uses ammonium persulfate to oxidize iodide ions to iodine. 2I- (aq) + S2O82- (aq) → I2 (aq) + 2SO42- (aq) Subsequently‚ sodium thiosulfate is used to reduce iodine back to iodide before the iodine can complex with the starch to form the characteristic blue-black color. I2 (aq) + 2S2O32- (aq) → 2I- (aq) + S4O62- (aq) An important factor that affects
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Key Issues The Gillette Company was founded in 1901 in a small office in Boston. Since its departure‚ Gillette has positioned itself as one of the most recognizable brands not only through their safety razor blades‚ but also through corporate diversification. This included the acquisition of a number of major companies‚ most recently Duracell. Prior to this acquisition‚ the Duracell Corporation had been the leading producer of alkaline batteries in the United States and maintained consistent
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The purpose of this report is to first discuss the reasons why Duracell’s performance has been decreasing over the past four years‚ and then recommend some strategic actions Gillette should take to turn Duracell around. This report will begin by providing a brief introduction on the acquisition of Duracell by Gillette‚ followed by the reasons it lacked success‚ and finally end with the proposed recommendations for Duracell. Currently‚ Gillette’s operating segments include personal grooming‚ small
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Silver Ore Crushing Plant Method Silver is generally extracted from ore via crushing‚ grinding‚ smelting ormaterial leaching. Zenith crushers have an very essential perform within silver ores exploration‚ especially in silver ores’ mashing course of action. The jaw crusher is extremely well-liked to the main crusher. Additionally‚ the cone crusher may be used as secondary crusher. The ball mill‚ Raymond mill orhigh strain mill is normally utilized as grinding gear for being ready to grind silver
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