redbrown from the presence of I3 - complex. 4. Titrate the iodine. Rinse the buret with distilled water and then three times with small portions of your 0.10 M sodium thiosulfate solution. Then‚ fill up the buret with the 0.10 M sodium thiosulfate solution. Titrate the bleach-iodine mixture in your Erlenmeyer flask until the iodine color becomes yellow. Add one dropperful of starch solution. The blue/black color of the starch-iodine complex should appear. Continue the titration until one drop
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important to our body because we need to use energy. The purpose of this lab is to figure which one is the monomer and which one is the polymer. Hypothesis: If I place two drops of iodine into the mystery powder‚ it would turn from brown to black ONLY if it was a polymer‚ if it’s not a polymer nothing would happen to the iodine‚ it would stay brown. If I mix Benedict’s Solution with water and the unknown powder all together and put it in to a water bath that’s on a hot plate for 5 min it would turn from
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Daiichi nuclear reactors in March 2011‚ a large quantity of radioactive caesium-137 and iodine-131 were released into the water supply. The Japanese government was accused of responding too slowly‚ and for not administering iodide prophylaxis to the exposed population. Iodine-131 is readily taken up by the thyroid gland‚ and the radioactivity can destroy the gland. However‚ this uptake of radioactive iodine can be blocked by giving iodide orally‚ thereby preventing hypothyroidism. The thyroid
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I predict that the water level will rise as the iodine stained water moves through the cellulose bag due to osmosis. The iodine is there so we can see this happening. Materials: * Dialysis(cellulose) tubing * Thistle funnel * Gas jar * Retort clamp and stand * Rubber bands * 50mL beaker * Iodine/potassium iodine solution * 5% starch solution Method: 1) Fill the gas jar to 3 quarters full with water. Add iodine solution until the water is quite yellow/brown.
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acid‚ reacts with iodine rapidly in an acidic medium. C6H8O6 (aq) + I2 (aq) C6H6O6 (aq) + 2H+(aq) + 2I- (aq) Since iodine dissolves slightly in water‚ ascorbic acid cannot be titrated directly by a standard solution of iodine. Therefore‚ back titration technique is employed in this experiment. In an acidic medium‚ potassium iodate(V) reacts with potassium iodide to produce iodine in situ. KIO3 (aq) + 5KI (aq) + 3H2SO4 (aq) 3I2 (aq) + 3H2O (l) + 3K2SO4 (aq) The iodine produced reacts
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What is the Winkler Method? The Winkler Method is a technique used to measure dissolved oxygen in freshwater systems. Dissolved oxygen is used as an indicator of the health of a water body‚ where higher dissolved oxygen concentrations are correlated with high productivity and little pollution. This test is performed on-site‚ as delays between sample collection and testing may result in an alteration in oxygen content. How does the Winkler Method Work? The Winkler Method uses titration to determine
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gauze(OR 90oC electric water bath OR hot plate) * 250 cm3 beaker * boiling tube * anti- bumping granules * forceps * test tube holder * white tile * leaf to be tested (hibiscus leaves are excellent) * 90% ethanol * iodine/potassium iodide solution PROCEDURE: The video above shows the steps in Testing a Leaf for the Presence of Starch. The Procedure outlined below is slightly different. 1. Remove a green leaf fom a plant that has been exposed to sunlight for
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recorded them and used our observations to propose a hypothesis. The experiments included chemical and physical reactions dealing with torn news paper‚ appearance of rock salt crystals‚ the appearance of sand‚ oil and water on plastic‚ and making iodine in water and mineral oil. We found that all these included four physical changes and two chemical changes. This was important in determining the substance or mixture that dealt with physical and chemical properties as well as homogeneous and heterogeneous
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titration. One of the best methods is the iodine-thiosulfate titration procedure. The iodide ion‚ I-‚ is easily oxidized by almost any oxidizing agent. In acid solution‚ hypochlorite ions oxidize iodide ions to form iodine‚ I2. The iodine that forms is then titrated with a standard solution of sodium thiosulfate. The analysis takes place in a series of steps: 1. Acidified iodide ion is added to hypochlorite ion solution and the iodide is oxidized to iodine. 2 H+(aq) + ClO-(aq)
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The most common use for iodine-131 is for the killing of thyroid cancer cells. The way this works is Thyroid cancer cells take up the iodine just as they would normally take up normal iodine. The Thyroid gland containing the cancer then has an accumulation of radioactive iodine-131‚ it gives off short range damaging beta radiation. This particular treatment has the benefit of being fairly localised
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