much starch grains are distributed within a transverse section of a banana Apparatus: banana‚ iodine solution‚ ruler‚ white tile‚ stopwatch‚ microscope slide‚ coverslip‚ filter paper‚ Light microscope Method: 1) A piece of banana was place on a tile and a section was cut across the piece of banana about 5mm thick. 2) The surface of the banana was covered with iodine solution and left for about one minute. 3) The distribution of starch in the section of the
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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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used is iodine-thiosulfate titration. It is a very useful method‚ since the iodide ion‚ I-‚ is easily oxidized by almost any oxidizing agent. The analysis takes place in a series of steps as follows: 1. A diluted sample of the bleach will be allowed to react with potassium iodide in acidic solution. The iodide ion will be oxidized to iodine while the hypochlorite ion will be reduced to chloride (Equation 1). 2 H+(aq) + OCl-(aq) + 2 I-(aq) ! Cl-(aq) + I2(aq) + H2O(l) (1) Iodine is not very
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of ascorbic acid by iodine. The solubility of iodine is increased by complexation with iodide to form triiodide I2 (aq) + I- ºI3- Triiodide then oxidizes vitamin C to dehydroascorbic acid C6H8O6+ I3-+ H2O → C6H6O6+ 3I-+ 2H+(2) Vitamin C dehydroascorbic acid The endpoint is indicated by the reaction of iodine with starch suspension‚ which produces a blue-black product. As long as vitamin C is present‚ the triiodide is quickly converted to iodide ion‚ and no blue-black iodine-starch product is observed
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not taste any substance in this experiment * Iodine solution and some powders are hazardous. * Wash hands when you have finished. Materials * Eye protection * Well plate * 6 small toothpicks for stirring each powder * 6 white powders: icing sugar‚ cornstarch‚ Aspirin powder‚ baking soda‚ baking powder‚ and the mystery powder * Scoopula * Test solutions in dropper bottles: water‚ universal indicator‚ vinegar‚ and iodine solution
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BABS1201 Group Enzymes Project Group Protocol Including Equipment and Reagents List Lab Day: Wednesday Lab Time: 10am – 1pm Are you in Lab G20 (furthest from BSB Student Office) or Lab G21 (closest to BSB Student Office)?: Demonstrator Name: Daniel Winters Names of Group Members: Johnny Nguyen‚ Therese Pham‚ Linda Tang Name of Enzyme You are Investigating: Amylase Brief Background: Amylase is a digestive enzyme‚ produced mainly by the salivary glands and the pancreas‚ to break down
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Reham Al Sultan Prof. Hirul‚ Term Paper 4/25/2014 Thyroid Disease Thyroid is a small gland found at the base of your neck‚ just below your Adam ’s apple. The thyroid produces two main hormones called T3 and T4. These hormones travel in your blood to all parts of your body. The thyroid hormones control the rate of many activities in your body. These include how fast you burn calories and how fast your heart beats. All of these activities together are known as your body ’s metabolism. A thyroid
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Pathophysiology. Thyroid hormones assume a vital role in the normal functioning of the body. Insufficiency in secretion from their source to respond to body needs in the body risks infection of hypothyroidism. They are secreted by the thyroid glands which are located in a close-range to the trachea between the cricoid cartilage and suprasternal notch where they possess two joined lobes by an isthmus. In addition‚ the thyroid hormones are inconclusive of triodothyronine (T3) and thyroxine (T4) that
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reaction: The bromine or iodine used in the titration is generated by adding an excess amount of KBr or KI to an acidified solution of the sample according to the following reaction: BrO3- + 5 Br- + 6 H+ 3 Br2 + 3 H2O IO3- + 5 I- + 6 H+ 3 I2 + 3 H2O Sodium thiosulfate solutions can be standardized by direct titration of the I2 generated in in the KIO3 reaction using the starch-iodine complex as the indicator (remember that the iodine is actually in the form of
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Investigation – Storage conditions of Bleach & it’s relation with temperature. Title/Research Question: ‘How does temperature effect the concentration of chlorate ions in bleach?’ Aim: The aim of this experiment was to investigate the optimum temperature storage conditions of bleach’s stored at different temperatures. Introduction: Chlorine bleaches are made by dissolving chlorine in sodium hydroxide solution. They have a number of uses as they are used to remove colors‚ whiten or disinfectant
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