concentration of the ascorbic acid in the tablet‚ a redox reaction of it with iodine was done. While iodine is an oxidizing agent and ascorbic acid is a reducing agent. The reaction forms dehydroascorbic acid and iodide. Ascorbic acid + I2 -> dehydroascorbic acid + 2 H+ + 2 I- However‚ Iodine does not dissolve in water very well. In this case‚ standard solution of potassium iodate(V) is used to produce aqueous iodine. Excess potassium iodide and dilute sulphuric acid is added to react with potassium
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most enzyme concentration because it looked thicker than the others. Therefore I thought it will need more Iodine whilst orange juice labeled B & C will need less Iodine because they looked lighter. Variables Independent: the amount of Iodine that was added to the the different types of orange juice Dependent: The color of the orange juice changed to dark purple depending on how much iodine that was put into orange juices. Controlled: the temperature of the orange juices and the amount of orange
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H2SO4 added to the solution/M 15.0 0.2 10.00 5.00 1.0 Qualitative data Colour of iodine is yellow brown Colour of KIO3=colourless liquid Colour remain the same after adding H2SO4 to the solution (colourless) Colour of KIO3 and H2SO=colourless Colour of the solution after adding 0.2MKI on KIO3 and H2SO is dark yellow brown (dark red colour appeared) After titrating standardized 0.1M sodium thiosulphate colour of iodine changed from yellow brown to pale yellow Colour change after adding indicator (starch)
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concentration to areas of lower concentration. The model membrane is dialysis tubing. Materials Used 2.5 cm dialysis tubing 15% glucose solution glucose test strip 1% starch solution distilled water Lugol’s iodine solution Procedure: Each member of the lab group will complete the procedures independently 1. Obtain a 30 cm piece of 2.5-cm dialysis tubing that has been soaking in water. Tie off one end of the tubing to form a bag. To open the other end
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affects the rate of an enzyme controlled reaction * evaluate the experimental procedure Procedure SAFETY: Follow your teacher’s instructions for handling the solutions. Wear eye protection when handling the iodine solution. Investigation * Place single drops of iodine solution in rows on the tile. * Label a test tube with the pH to be tested. * Use the syringe to place 2 cm3 of amylase into the test tube. * Add 1 cm3 of buffer solution to the test tube using a syringe
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edges. Size was 7mm x 8mm with translucent color and was fewer luster. Water: Bubble effect ‚ remained stationary. Size was 4mm x 4mm‚ translucent and more luster than the oil. E. Making iodine in water: potassium iodide (KI)‚ and sodium hypochlorite (bleach‚ NaClO). F. Making iodine in oil: mineral oil‚ water‚ potassium iodide‚ and sodium hypochlorite Initially: H2O in center of oil‚
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Final Year Project Progress Report Title: Fat Content Analysis and Characterization of Food Class and Group No. : AS114103/2A1 Student Names : Chan Hoi Ching (120586347) : Chan Wai Yi (120464356) : Cheung Kit Cheung(120552694) : Lam Chi Ching (120224281) : Lam Pik Shan (120181829)
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Introduction: The purpose of this lab was to check the time needed for salivary amylase and phosphorylase to produce a negative result and how different concentrations affected those times. Enzymes are biological catalysts that can cause a specific chemical change in any part of the body (Walsh‚ 2002). Many of the reactions that take place within a cell would normally take place at temperatures substantially higher than those present inside a cell (Alberts et al.‚ 2010). Because of this‚ these chemical
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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 + 2 e− Combining these half-equations demonstrates the reaction between iodate and iodide 2 IO3− + 10 I− + 12 H+ → 6 I2 + 6 H2O It is the iodine formed by this reaction that oxidises the ascorbic acid to dehydroascorbic acid as the iodine is reduced to iodide ions. ascorbic acid + I2 →
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Hypothesis : The diffusion of molecules across a semi permeable membrane is based on the size of the molecule Variables: a) Manipulated : Size of solute molecules b) Responding : Colour of solution c) Fixed : Temperature and time Materials : Iodine solution‚ Benedict’s solution‚ 1% starch suspension‚ 30% glucose solution and distilled water Apparatus : A Visking tube‚ cotton thread‚ test tubes‚ beaker and water bath Procedure - Soak the Visking tube in water for 5 minutes to soften it
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