metals than other halogens‚ but its reactions are analogous to the reactions of alkali metals with fluorine‚ chlorine and bromine. Compounds of an alkali metal and a halogen‚ such as sodium chloride‚ potassium fluoride‚ lithium bromide‚ or caesium iodide‚ have closely related properties. They belong to a general category called salts‚ all of whose members are similar to ordinary
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PHILIPPINES‚ DILIMAN‚ QUEZON CITY 1101‚ PHILIPPINES DATE SUBMITTED: JANUARY 8‚ 2013 DATE PERFORMED: DECEMBER 5‚ 2012 ------------------------------------------------- ABSTRACT The kinetics of the reaction between persulfate (S2O82-) and iodide (I-) ions was studied in the experiment. Temperature‚ concentration of reactants and catalyst presence were the different factors examined if they had an effect on the rate of reaction between S2O82- and I-. The reaction of interest was timed by measuring
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throughout the procedure are outlined below: Mn2+ + 2OH– + 1/2 O2 oxygen-manganese complex + H2O (1) oxygen-manganese complex + 4H+ + 2I– I2 + Mn2+ + 2H2O (2) I2 + 2Na2S2O3 Na2S4O6 + 2NaI (3) Addition of the manganous sulfate and the alkaline-iodide results in the formation of an insoluble oxygen-manganese complex (1)‚ the precipitate in step 2. The oxygen is stable in this form for several days. Both the
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sufficiently rinse the cleaned test tube with DI water. Methylene chloride‚ CH2Cl2‚ which is a non-polar organic compound was added to the solution reacted with the iodide in the solution to form a violet coloured layer of denser solution‚ which settled at the bottom of the test tube. An alternative means of testing for the presence of iodide anions would have been to use starch‚ which forma a characteristic blue-black
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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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different compounds are being worked with – potassium iodide‚ lead (II) nitrate‚ acetic acid and sodium bicarbonate. The purpose of this experiment is to determine whether or not a reaction has taken place using qualitative and quantitative analysis. Procedure Part 1 - Qualitative observations of both potassium iodide and lead (II) nitrate were recorded in a table. Then‚ the equipment and chemicals needed were gathered – potassium iodide and lead (II) nitrate‚ a graduated cylinder‚ Erlenmeyer
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with potassium iodate in the presence of potassium iodide. Vitamin C‚ more properly called ascorbic acid‚ is an essential antioxidant needed by the human body (see additional notes). When iodate ions (IO3−) are added to an acidic solution containing iodide ions (I−)‚ an oxidation-reduction reaction occurs; - the iodate ions are reduced to form iodine Burette containing potassium iodate solution IO3− + 6 H+ + 5 e− → ½ I2 + 3 H2O - while the iodide ions are oxidised to form iodine. 2 I− → I2 +
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Chemistry F332 Notes Ions in solids and solutions: Structure of an ionic lattice (Sodium Chloride): * Consists of sodium ions (Na+) surrounded by six chloride ions (Cl-) * Chloride ions also surrounded by six sodium ions. * Held together by attraction of oppositely charged ions. * Giant ionic lattice. * Electrostatic bonds hold lattices together. * Structure is simple cubic. * Some ionic crystals contain water. * Known as water of crystallisation. * These crystals
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Water-We studied the difference between mineral oil and water using a hand lens. * Making iodine in water- We added one drop of potassium iodide and sodium hypochlorite (bleach) then mixed the two together producing iodine. * Making iodine in oil-We added two drops of mineral oil‚ one drop of water on the mineral oil‚ then added one drop of potassium iodide and sodium hypochlorite. Producing Iodine. Results: In class we conducted four experiments on
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