time and how varying concentrations of KI and H2O2 solutions affects the rate of reaction. 2 - Use an iodine clock: add 2cm3 of 0.1moldm-3 sodium thiosulphate (Na2S2O3) and 1cm3 of 1% starch solution at the start of the reaction. The added sodium thiosulphate reacts with the iodine as it’s formed: I2 + 2Na2S2O3 -> 2NaI + Na2S4O6 When the sodium thiosulphate is all used up the iodine remains in solution and reacts with the starch indicator to make the blue colour. I will vary the temperature and
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Volume of sodium thiosulphate Na2S2O3 solution used It will be kept fixed at 2 cm3 throughout the experiment. Volume of starch solution used It will be kept fixed at 5 drops throughout the experiment. Volume of iodide I- solution used It will be kept fixed at 10cm3 throughout
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temperature‚ small chips ? high temperature‚ small chips‚ dilute acid ? large chips‚ concentrated acid‚ low temperature ? low temperature‚ small chips‚ dilute acid Image50.gifImage51.gifImage52.gifSodium thiosulphate solution reacts with hydrochloric acid to form sodium chloride‚ sulphur dioxide‚ sulphur and water. The reaction can be followed by measuring the time it takes for enough of the sulphur precipitate to form to obscure a black cross marked on white paper. Which will decrease
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Kinetics of the Harcourt-Essen Reaction Name: Manpreet Kaur Candidate Number: 7123 AS and A2 Aims: AS AIMS: 1. Investigate the effect of temperature on the rate of reaction. For this aim 3 sets of results will be obtained by timing how long it takes for the colour change to occur in different temperatures determined by the use of an electric water bath. With these results‚ the effect of temperature on the rate of reaction will be investigated. 2
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potassium iodide (KI) in acidified medium. IO3- + 5I- + 6H+ → 3I2 + 3H2O The excess iodine that has not reacted with ascorbic acid in fruit juices (vitamin C) is then back titrated by standardized sodium thiosulphate solution. Iodine can be decolourized by thiosulphate ion. 2S2O32- + I2 → S4O62- + 2I- Starch solution‚ indicator of the titration‚ is added near the end of the titration when the solution is straw-coloured. Any iodine present will react with starch to form
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Chemicals Vitamin C tablet‚ (1) standard 0.0110 M potassium iodate (KIO3) solution‚ (100 cm3) standard 0.060 M sodium thiosulphate solution‚ (Na2S2O3‚ 160 cm3) 1 M potassium iodide solution‚ (KI‚ 20 cm3) 0.5 M H2SO4‚ (150 cm3) freshly prepared starch solution. Apparatus Titration apparatus Principle In this experiment you are required to determine the vitamin C content of a commercial tablet and compare this with the manufacturers specification. Vitamin C is ascorbic acid‚ which is rapidly and quantitatively
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potassium iodide. 2) Drawes a cross on a white paper that will be easier to observe the intensity of dark blue intensity. Procedures: 1. KI‚starch and sodium thiosulphate were mixed into a boiling tube following the table which was an attachment(Data treament). 2. The mixture was transferred to a 100cm3 beaker. 3. The exact amount of sodium peroxydisulphate was added in a boiling tube to the mixture in (2) as soon as possible. At the same time‚ the stop watch was stared. 4. The time for the
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Tittle : Rancidity Measurement in Fats and Oils. Introduction : Vegetable oil is an important and widely used lipid source for our everyday food products. Its application is increasing day by day for food purposes and for the manufacturing of a number of toiletry products. However‚ some vegetable oils are not up to standards to meet consumer satisfaction in terms of their physico-chemical properties or for the texture and stability of the food products (Reyes- Hernandez et al.‚ 2007). Recently
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1M = 5.105g = 0.1N | Potassiun hydrogen iodate KH(IO3)2‚ FW = 389.92‚ Eq. 73.07g/l 250ml 0.1M = 9.75g = 0.1N | Sodium carbonate Na2CO3‚ FW = 106‚ Eq. =53g/l 250ml 0.05M = 1.325g = 0.1N | Sodium hydroxide NaOH‚ FW = 40‚ Eq. = 40g/l 250ml 0.1M = 1.0g = 0.1N 1 liter 0.1M soln = 4g = 0.1N | Sodium oxalate Na2C2O4‚ FW = 134.00‚ Eq. =134g/l 250 0.1M = 3.35g = 0.1N | Sodium tetraborate NaB4O7.10H2O‚ FW = 381.37‚ Eq. =190g/l 250ml 0.05M = 4.762g =0.1N | Succinic acid HO2CCH2CH2CO2H
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catalytic decomposition of hydrogen peroxide Solid manganese(IV) oxide is often used as a catalyst in this reaction. Oxygen is given off much faster if the hydrogen peroxide is concentrated than if it is dilute. The reaction between sodium thiosulphate solution and hydrochloric acid This is a
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