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  1. 1. Precipitation in Double Displacement Reactions<br />PIERRE COMAS<br />CRISTINA RÍOS<br />
  2. 2. Introduction Double Displacement Reactions<br />A double displacement reaction involves the reaction of two compounds to form two new compounds. In effect, the compounds change partners with each other.<br />
  3. 3. Purpose<br />Purpose<br />The purposes of this experiment are:<br />1. To observeprecipitationreactionsbymixingaqueoussolutions of cations and anions.<br />2. To write and balancecompletechemicalequations for precipitationreactions<br />
  4. 4. Materials<br />The materials needed are the following: <br />Pb(NO3)2 CaCl2<br />KI NaCl<br />NaOH FeCl3<br />Na2CO3 CuSO4<br />AgNO3 Test tubes<br />KNO3 Test tube racks<br /> <br /> <br />
  5. 5. Procedure of these reactions<br /> Put 21 clean test tubes in a test tube rack.<br />Add 6 drops of the solutions indicated which are: KI,<br />NaCl, NaOH, FeCl3, KNO3, Na2CO3, CuSO4 to 7 clean test tubes . <br />Add 6 drops of AgNO3 solution to each test tube.<br />Observe and record information and colour of any precipitate formed .<br />Do the same with Pb(NO3)2 and with CaCl2. <br />Clean the test tubes and dispose of the waste in the waste container.<br />And finally write correct equations for all of the reactions where a precipitate was formed.<br />
  6. 6. Reactionswith AgNo3<br />When we add a small quantity of Potassium Iodide to Silver Nitrate two compounds are produced Potassium Nitrate and a precipitate of Silver Iodide. <br />AgNO3 + KI -> KNO3 + AgI↓<br />The precipitate has a yellow colour. <br />
  7. 7. AgNO3 and NaCl<br />When we add a small quantity of Sodium Chloride solution to Silver Nitrate solution it produces Sodium Nitrate and a precipitate of Silver Chloride.<br />AgNO3 + NaCl-> NaNO3 + AgCl↓<br /> The precipitate has a white colour. <br />
  8. 8. AgNO3 and CuSO4<br />Copper nitrate and Silver Sulphate are formed when Silver Nitrate and Copper Sulphate react with each other. <br /> The precipitate is Silver Sulphate.<br />AgNO3 + CuSO4-> Cu(NO3)2 + Ag2SO4<br />The colour of the precipitate is a light blue.<br />
  9. 9. AgNO3 and Na2CO3<br />Silver Nitrate and Sodium Carbonate react to form Sodium Nitrate and Silver Carbonate. The precipitate is Silver Carbonate. <br />AgNO3 + Na2CO3 -> Na2CO3 + Ag2CO3↓<br />The precipitate’s colour is light green. . <br />
  10. 10. AgNO3 and FeCl3<br />Iron Nitrate and Silver Chloride are produced when Silver Nitrate reacts with Iron(III) Chloride. <br />AgNO3 + FeCl3-> Fe(NO39 + AgCl3↓<br />The precipitate´s colour is light yellow. <br />
  11. 11. Reactions with Lead (II) Nitrate<br />Potassium nitrate and Lead Iodide<br /> are formed when Lead (II) Nitrate<br /> reacts with Potassium Iodide . <br />The precipitate is Lead Iodide.<br />Pb(NO3)2 + 2KI -> 2KNO3 + PbI2<br />The precipitate´s colour is yellow.<br />
  12. 12. Pb(NO3)2 and NaCl<br />When Lead (II) Nitrate reacts with <br /> Sodium Chloride it produces<br /> Sodium Nitrate and Lead (II) chloride.<br />Pb(NO3) + 2NaCl ->2NaNO3 + PbCl2<br />The precipitate has a white colour.<br />
  13. 13. Pb(NO3)2 and KNO3<br />When Lead (II) Nitrate and Potassium <br />Nitrate react with each other they <br />produce equal products as reactants<br />because, Potassium takes the <br />place of Lead and Lead takes the place <br />of Potassium. <br />Pb(NO3)2 + KNO3 -> KNO3 + PbNO3<br />The precipitate is a <br /> transparent white. <br />
  14. 14. Pb(NO3)2 and Na2CO3<br />When Lead (II) Nitrate and <br /> Sodium Carbonate react they <br /> produce Sodium Nitrate<br /> and Lead Carbonate as a precipitate.<br />Pb(NO3)2 + Na2CO3 -> Na2NO3 + PbCO3<br />The precipitate has got a whitecolour.<br />
  15. 15. Pb(NO3)2 and NaOH<br />Sodium Nitrate and Lead (II) Hydroxide are formed when Lead (II) Nitrate and Sodium Hydroxide react with each other.<br />Pb(NO3)2 + 2NaOH -> 2NaNO3 + Pb(OH)2<br />The precipitate has got a white <br /> colour. <br />
  16. 16. In all the reactions Silver was a precipitate because Silver is a solid and does not mix in solutions and is left at the bottom of the test tube.<br />The two cations which form precipitates are Iodine and Chloride.<br />Conclusion<br />
  17. 17. Remember: It is prohibited to drink any of the products used in this experiment. <br />
  18. 18. Thanks for yourattention<br />