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) to the solution is blue (dark brown
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enzyme amylase responsible for catabolizing starch polymers and to see how different temperatures affected the rate as well as how effectively the enzyme worked. To proceed with the experiment the group set up four different test tubes for each‚ bacteria and fungal amylase‚ and labeled them accordingly with different temperatures as well as different solutions . Then the spot plates were placed on the time and temperature table created with napkins and iodine was added to the first row were the solutions
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Fats and oils - 344 Iodine value of an edible oil INTRODUCTION Fats and oils known as triglycerides contain long chain hydrocarbons with carboxyl groups (COOH groups). These fatty acids are classified into the number of double bonds present in the fatty acid. When the carbon atoms in these chains are bounded to the maximum possible number of hydrogen atoms‚ the triglyceride is said to be saturated. When one or more double bonds exist between carbon atoms in the chain‚ less hydrogen exists
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weight allow separation of polymers from their monomers. Methods of dialysis and gel filtration chromatography will be used to separate a glucose monomer from a starch polymer. Colorimetric glucose oxidase assay will be used to monitor the presence of glucose and a colorimetric iodine assay will be used to monitor the presence of starch in prepared solutions after separation Results and Discussion Table 1: Glucose oxidase assays |Reagents |Volume (mL)
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blue | blue | neg | starch | Cloudy blue | Cloudy blue | neg | fructose | blue | orange | pos | Lemon juice | Teal/blue-green | green | neg | Orange juice | green | Creamy orange | pos | Non-diet soda | blue | orange | pos | Diet soda | blue | blue | neg | 5.2 Carbohydrate Test 1. Obtain five test tubes. Label each one 2. Use a graduated cylinder to transfer 5 mL of distilled water 3. Repeat step 2 with each of the food substances. 4. Add 5 drops of Iodine to each test tube.
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) Ascorbic acid‚ C6H8O6‚ is a reducing agent that reacts rapidly with iodine (I2) in acidic medium to produce iodide ion (I-) and dehydroascorbic acid‚ as shown in the following equation: [IMAGE] + I2(aq) -----------> + 2H+(aq) + 2I-(aq) Ascorbic acid (Vit. C) Dehydroascorbic acid However‚ since iodine is only slightly soluble in water‚ ascorgic acid should not be titrated directly by a standard iodine solution‚ since the end point of titration is not o obvious. Instead‚
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ACKNOWLEDGEMENT This project was done with the aid of a lot of people. I take this chance to express my gratitude to Mrs. Hamidah Bt. Ahmad for the guidance and motivation that contributed tremendously to this project. My thanks and appreciations go to my friends in developing this project too. TITLE Analysis of Vitamin C in fresh brand orange‚ pineapple and apple juices. ABSTRACT Vitamin C plays an important role in our daily lives as a nutrition for our health. Tropical brand pineapple juice
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then in the presence of Iodine‚ their colors if the test sample contains sugars‚ then the iodine will change from yellow-brown to blue-black. 4. If the test samples show the presence of lipids‚ the when the substance is placed onto a brown paper bag and sits for 10 minutes‚ then a translucent or opaque spot will appear. Materials: * 8 test tubes * test tube rack * test tube holder * glass stirring rod * sharpie marker * how water bath * iodine solution * brown
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reaction may also be known as the ‘Iodine Clock Reaction.’ The rate of the reaction will be measured by timing the reaction between Hydrogen Peroxide‚ Potassium iodide‚ and Sodium Thiosulphate. Sodium Thiosulphate is used as a delaying mechanism as the reaction between the two main reactants is too rapid to measure. The Sodium Thiosulphate will react with the Iodine [III] ions (the product) first and when the all the Sodium Thiosulphate has reacted‚ then the remaining Iodine ions will form a blue-black
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A KINETIC STUDY OF AN IODINE CLOCK REACTION PURPOSE To investigate the kinetics of the reaction that occurs between iodide and persulfate ion. You will: (1) determine the rate law‚ (2) determine the numerical value of the rate constant at room temperature‚ (3) explore the effect of temperature on the reaction and determine the activation energy (Ea)‚ and (4) investigate catalytic activity of selected metal ions on the reaction. INTRODUCTION Reaction times vary from picoseconds (10-12 seconds)
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