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Redox reactions and the halogens.
Member rating: No Rating | Words: | Submitted: Mon Jun 28 2004
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Module 2 Topic 6 Redox reactions and the halogens Reactivity is related to electronic structure and position in periodic table. Sources of halogens Halogen Abundance (parts per million by mass) In rocks In the sea Source Relative cost of Sodium halide Chemical process to obtain free element Fluorine 700 1.4 Fluorite, CaF2 8 Electrolysis of a solution of Potassium and hydrogen fluoride Chlorine 200 19000 Rock salt, NaCl 1 Electrolysis of (aq) saturated NaCl solution Bromine 3 67 Sea water 4 Oxidation of bromide solution by chlorine Iodine 0.3 0.05 Underground brines and caliche, NaNO3 containing NaIO3 20 Reduction of iodate solution by odium hydrogensulphite Expt 6.1 Extraction of iodine from seaweed Solvent extraction 1. Desired product has a low solubility in one solvent 2. The impurities have a high solubility in the same solvent 3. A second solvent, immiscible with the first is added 4. The product is soluble in the second solvent and is transferred 5. The impurities remain in the first solvent which is discarded Iodine comes from caliche, a mineral. Redox Reactions and oxidation numbers Chlorine displaces bromine from bromide and iodine from...
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