almost perfect circle‚ takes longer to reach max expansion‚ covers more surface area‚ lays flatter on surfaceWater: did not form even circle‚ reached max expansion very quickly‚ formed more of a bubble on surfaceBOTH: Clear and shiny | e) Making iodine in water: potassium iodide (KI)‚ and sodium hypochlorite (bleach‚ NaClO). | KI- ClearNaOCl- ClearWhen combined they solution immediately turned a bright yellow. |
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drops of iodine solution to tube 5. (i) To the remaining liquid in tube 3‚ add about 20 mm Benedict’s solution and place the tube in the boiling water bath for 5 minutes. (j) Pour half the contents of tube 4 (starch and saliva) into tube 6 and then add three drops of iodine to tube 6. (k) Test the remaining liquid in tube 4 with Benedict’s solution as you did in (i). (l) Pour half the contents of tube 7 (starch solution) into tube 8 and test the two samples respectively with iodine as in
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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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C: freshly squeezed OJ‚ bottled OJ‚ frozen OJ‚ canned OJ * Optional: container for waste solutions and source of clean rinse water There are two different preparations (starch-iodine or indophenol) that may be used for the vitamin C indicator solution. Neither is more accurate than the other. The starch-iodine mixture is much cheaper. It can be made ahead and stored in a dark‚ cool place in two liter soda bottles and dispensed in liter containers at the lab stations. Both indicators vary from
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beaker Medium Ring for Ringstand Weight scale Matches Distilled water Wire gauze 50 ml cylinder Evaporating dish Funnel Filter Paper Ringstand Wash Bottle Glass stirring rod Tincture of Iodine Mineral Oil Silver Nitrate Iodine Crystals Small Test tubes The first thing we had to do was fill a 150 ml beaker with 6 grams of dried seaweed‚ which we had to approximate on a
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Lab report Aim : To check the presence of starch in the leaves Hypothesis : the presence of starch can be detected if the specimen turns black blue after iodine solution. Materials : 1) Green leaves 2) Wire gauze 3) Iodine solution 4) Forceps 5) Specula 6) Bunsen’s burner 7) Test tube 8) Water 9) Tile 10) tripod stand 11) glass 12) slide 13) dropper 14) water 15) water bath Procedure: collect dark green leaves (as leaves contain starch) take a water bath and let it heat
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10ml test tubes were set up‚ with one set for each of the following sample solutions: water‚ protein‚ starch‚ lipid‚ vitamin C and an unknown sample. 0.5 L of each solution was added to each tube. One drop of each of the three indicator solutions (iodine‚ Sudan III and Biuret & copper sulfate) was added to each sample solution to determine how that sample solution (and that type of macromolecule) would react with each specific indicator. The results were recorded in the data chart below. The identity
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performance liquid chromatography (HPLC). 2.2.3 Enzymatic method. 4 4 4 6 6 CHAPTER 3 METHODOLOGY. 3.1 Method using iodometric titration 3.2 Materials and reagents. 3.3 Preparation of iodine solution. 3.4 Preparation of vitamin C standard solution. 3.5 Standardisation of iodine solution with the vitamin C standard solution 3.6 Titration of
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oxidized by iodine in acidic solution according to the following equation Ascorbic acid The standard method for determination of ascorbic acid involves the direct titration of acidified sample with a standard iodine solution. But the low solubility of iodine makes this procedure less than ideal. The proposed experiment avoids these difficulties is by using the reaction between iodide (in excess) and iodate which generate a known excess quantity of iodine‚ and this excess iodine is back
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Have you ever wondered if you might a thyroid condition? Do you even know what the main symptoms are that may indicate if you have one? The main symptoms of that indicate that you may have a problem with your thyroid include: • Feeling tired‚ day after day • Weight gain • Chills • Hair loss • Brain fog • Increase sweating • Anxious • Dry Skin • Brittle nails • Numbness or tingling of the hands • Constipation • HeaHeahHeavy Heavy periods • MusM Muscle weakness
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