ions. The potassium manganate(VII) is an oxidising agent. Potassium manganate(VII) and sulphur dioxide Another redox colour change takes place when potassium iodide‚ which is colourless‚ is oxidised by an oxidising agent to form brown iodine solution. An example of this reaction is potassium iodide solution reacting with a solution of hydrogen
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oxygen in the water. If acid isn’t added the solution will quickly start to turn yellow due to formation of MnO2. If this happens anyway‚ add some more sulphuric acid to reverse the process. The solution should be clear with a slight green tinge. Chapter 15 – Volumetric analysis (Redox titrations) To prepare a standard solution of ammonium iron sulphate and use this solution to standardise a solution of potassium permanganate. Potassium permanganate (KMnO 4 ) is a powerful oxidizing agent and is
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iodometry- the winkler’s method. Apparatus: volumetric pipette‚ 3 conical flask‚ burette‚ burette clamp‚ Pasteur pipette‚ reagent bottle‚ conical flask stopper‚ retord stand‚ white tile Materials: 2 ml manganese sulphate solution‚ 2 ml alkaline-iodine solution‚ 0.025M sodium thiosulphate solution‚ 2ml concentration sulphuric acid‚ starch solution Procedure 1. When sampling water‚ care must be taken to ensure that a good representative sample of the water to be analyzed is obtained. For most
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because there was no colour change revealing the presents of proteins Part 2: Test for Starch Iodine Test for Starch Test Tube Contents Colour Change Conclusions 1 Starch suspension White (starch) and brown (iodine) > dark blue-black Therefore starch is present due to the change of colour in the solution 2 Distilled water Transparent (water) and brown (iodine) > translucent orange (diluted iodine) Therefore starch is not present due to the lack of reaction in the solution Part 3: Tests for
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The first lab will investigate the movement of glucose and starch across a selectively permeable membrane through a process of diffusion. The movement of a solute through this membrane is called dialysis . Diffusion is a form of passive transport. It is the movement of molecules from areas of higher concentration to those of lower concentration‚ until there is an even concentration. This movement is random because it is a result of kinetic energy. Diffusion is a slow process‚ but there are many factors
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The autoimmune diseases are‚ simply put‚ the process which the immune system attacks its own healthy tissues and organs. How this works is‚ our bodies have an immune system‚ which is a complex network of special cells and organs that defends the body from germs and other foreign invaders. At the core of the immune system is the ability to tell the difference between self and nonself‚ especially if there’s a flaw the body makes. When this happens‚ the body makes autoantibodies that attack normal cells
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G-250 * Bradford Reagent * Bovine Serum Albumin = BSA * Reagent blank = test tube #1 = 0mL BSA stock solution‚ 1mL distilled H2O * 595nm * Plot A595 vs concentration of BSA Experiment 4: Enzymatic Activity of Salivary Amylase * Iodine test – presence of starch * 1/t vs temperature/pH Experiment 5: General and Specific Tests for Carbohydrates | Reagents | Principle | Test for | Positive Result | Negative Result | Molisch | Molisch Reagent ‚Conc. H2SO4 | hydrolysis‚ dehydration
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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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your mixture‚ discuss the possibilities for the mixture. The starch and mixture 2 are both similar because they both did not penetrate when the vinegar was added; when the water was added the laid on top and did not penetrate completely; when the iodine solution was added to both they it turned black. Mix 1 would be substances 2 and 4; Mix 2 would be 1 and 5. Compare
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Austin Peay State University Department of Chemistry CHEM 1021 IDENTIFYING CARBOHYDRATES (adapted from Blackburn et al.‚ Laboratory Manual to Accompany World of Chemistry‚ 2nd ed.‚ (1996) Saunders College Publishing: Fort Worth) Purpose: To become familiar with some of the characteristic reaction of carbohydrates. To identify an unknown carbohydrate. Caution: Wear eye protection because of the possible shattering of dropped glassware and because acids are used in this experiment
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