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6 displacement of halogen from its halide solution

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Displacement of halogen

Displacement of halogen


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  • 1. By :SuziShaf REDOX REACTION Displacement of halogens from halide solutionHalogens : element in group 17 (chlorine, Cl2 , bromine, Br2 , and iodine, I2 )Halides : element of ion in group 17 (chloride ion, Cl- , bromide ion, Br- and iodide ion, I- )Still remember ????? When go down group 17, REACTIVITY of halogen decrease.Why …..? (answer)So, the power of halogen as oxidizing agent also decrease when godown the group. This means halogen at higher position in group 17 can displace halogen at lower position, from it halides solution.Thus;There are three reactions that can take place.Can you state all these three processes? 1
  • 2. By :SuziShafHalogen colour in tetrachloromethane is usually use toidentify the type of halogen presence.Observe the reaction below:i. (shake the mixture 3 strongly) 2 cm +tetrachloromethane → solution Colour of chlorine 2 cm3 chlorine water in water solution tetrachlorometane (pale yellow /colourless) (pale yellow / colourless)ii. (shake the mixture 2 cm3 strongly) + tetrachloromethane → solution 2 cm3 Colour of bromine bromine water water in solution (brownish yellow) tetrachloromethane (orange) 2
  • 3. By :SuziShafiii. (stronger shake the 3 mixture) 2 cm + tetrachlorometana → solution 2 cm3 iodine Colour of iodine in water/solution tetrachlorometane (brown) (purple)Complete the following table: The colour in the Colour in aqueous solutionHalogen tetrachloromethan concentrate dilute e dChlorinewater,Cl2Brominewater,Br2Iodinewater, I2Halogen can be identify by mixing thetetrachloromethane agent solution to the aqueoussolution. Water and tetrachloromethane will not 3
  • 4. By :SuziShafdissolve together but will form two layer. The upperlayer is water and below is tetrachloromethane layer.Tips : look at the colour of the tetrachloromethane layerto determine the halogen that presence. Cl2 + 2KBr → Br2 + 2KCl (shake the (add and mixture shake the strongly) mixture) + + tetrachlorometane 3 3 2 cm potassium 2 cm → bromide solution 2 cm3 chlorine water solution solution (pale yellow/ (colourless) Water layer: yellow colourless) Tetrachlorometane layer :orangeChlorine is more reactive than bromine, the strength of oxidizing agent for chlorine is more stronger than bromine.Thus chlorine will displace bromine from potassium bromidesolution. Orange colour in tetrachloromethane layer proved thepresence of bromine, Br2 in the mixture.Chlorine is reduced to chloride ion.Chlorine also act as oxidizing agent. Half equation : Cl2 + 2e → 2Cl-The oxidation number of chlorine is decreases from 0 to -1. 4
  • 5. By :SuziShaf1 molecule of chlorine gains 2 elctrons to form 2 chloride ions.Thus, chlorine undergoes reduction process.Bromide ion is oxidize to bromine.Bromide ion also act as reducing agent. Half equation : 2Br- → Br2 + 2eThe oxidation number for bromine is increases from -1 to 0.2 bromide ions loses 2 electrons to become 1 bromine moleculeBromide ions is undergoes oxidationTotal ionic equation : Cl2 + 2Br- → 2Cl- + Br2How this process is made?Considered the following reaction; Cl2 + 2KI → I2 + 2KCl 5
  • 6. By :SuziShaf (stronger (add and shake the shake the mixture) mixture) + + tetrachlorometane → 3 2 cm solution2 cm3 chlorine 2 cm3 potassiumwater solution iodide solution (pale yellow/ (colourless) Water layer: yellow colourless) Tetrachlorometane layer purpleChlorine is more reactive than iodine,Thus chlorine will displace iodine from potassium iodidesolution.The purple colour in tetrachloromethane layer provedthe present of iodine, I2 in the solution.Can you state all the following matter?; Cl2 + 2e  2Cl- 2I-  I2 + 2e i. Changes of oxidation number for chlorine in this reaction. ii. Changes of oxidation number for iodine in this reaction. iii. Substances that is oxidize : I- iv. Substances that is reduced : Cl2 v. Oxidizing agent vi. Reducing agent vii. Half equation for oxidation process viii. Half equation for reduction process ix. Total ionic equation x. Observation in the reaction above 6
  • 7. By :SuziShafHow this reaction is made?Considered this reaction; Br2 + 2KI → I2 + 2KBr (stronger (add and shake the shake the mixture) mixture) + + tetrachlorometane 3 ) 2 cm → solution 2 cm3 2 cm3 potassium bromine water iodide solution solution (brown) (colourless) Water layer: yellow Tetrachlorometane layer :purpleBromine is more reactive than iodine, so the power of oxidizingagent for chlorine is more stronger than iodine. By that, brominewill displace iodine from it potassium iodide solution. The purplecolour in tetrachlorometane layer prove the present of iodine, I2 inthe solution.Can you state all the following matter?; i. Changes of oxidation number for bromine in this reaction. ii. Changes of oxidation number for iodine in this reaction. iii. Substances that is oxidize iv. Substances that is reduced v. Oxidizing agent vi. Reducing agent vii. Half equation for oxidation process viii. Half equation for reduction process ix. Total ionic equation 7
  • 8. By :SuziShaf x. Observation in the reaction above (stronger (add and shake the shake the mixture) mixture) + + tetrachlorometane 32 cm 3 2 cm →bromine water solution 2 cm3 potassiumsolution iodide solution (pale yellow/ (colourless) Water layer: yellow colourless) Tetrachlorometane layer :orange (stronger (add and shake the shake the mixture) mixture) + + tetrachlorometane 3 2 cm → solution2 cm3 iodine 2 cm3 potassiumwater solution iodide solution (pale yellow/ (colourless) Water layer: yellow colourless) Tetrachlorometane layer :purple 8
  • 9. By :SuziShaf (stronger (add and shake the shake the mixture) mixture) 2 cm3 + + tetrachlorometane → solution2 cm3 iodine 2 cm3 potassiumwater solution bromide solution (pale yellow/ (colourless) Water layer: yellow colourless) Tetrachlorometane layer :purple 9
  • 10. By :SuziShaf (stronger (add and shake the shake the mixture) mixture) 2 cm3 + + tetrachlorometane → solution2 cm3 iodine 2 cm3 potassiumwater solution bromide solution (pale yellow/ (colourless) Water layer: yellow colourless) Tetrachlorometane layer :purple 9