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Preciptation reactions 1
 

Preciptation reactions 1

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    Preciptation reactions 1 Preciptation reactions 1 Presentation Transcript

    • Precipitation in Double Displacement Reactions
      PIERRE COMAS
      CRISTINA RÍOS
    • Introduction Double Replacement Reactions
      A double displacement reaction involves the reaction of two compounds to form two new compounds. In effect, the compounds change partners with each other.
    • Purpose
      Purpose
      The purposes of this experiment are:
      To observeprecipitationreactionsbymixingaqueoussolutions of cations and anions.
      To write and balancecompletechemicalequations for precipitationreactions
    • Materials
      The material which we need are following:
      Pb(NO3)2 CaCl2
      KI NaCl
      NaOH FeCl3
      Na2CO3 CuSO4
      AgNO3 Test tubes
      KNO3 Test tubes rack
       
       
    • Procedure of these reactions
      We put 21 clean test tubes in a test tube rack.
      We add 6 drops of the solutions indicated which are: KI,
      NaCl, NaOH, FeCl3, KNO3, Na2CO3, CuSO4 to 7 clean test tube .
      We add 6 drops of AgNO3 solution to every test tube.
      We have to observe and record information and colour of any precipitate formed .
      We do the same with Pb(NO3)2 and with CaCl2.
      We clean the test tubes and dispose of the wastes in the waste container.
      And finally we write correctly equations for all of the reactions where a precipitate is formed.
    • Reactionswith AgNo3
      When we add a small quantity of Potassium Iodide to Silver Nitrate two compounds are produced Potassium Nitrate and a precipitate of Silver Iodide.
      AgNO3 + KI -> KNO3 + AgI↓
      Precipitate has got a Yellow colour.
    • AgNO3 and NaCl
      When we add a small quantity of Sodium Chloride solution to Silver Nitrate solution it produce Sodium Nitrate and a precipitate of Silver Chloride.
      AgNO3 + NaCl-> NaNO3 + AgCl↓
      Precipitate has got white colour.
    • AgNO3 and CuSO4
      Copper nitrate and Silver Sulphate are formed when Silver Nitrate and Copper Sulphate react with each other.
      The precipitate is Silver Sulphate.
      AgNO3 + CuSO4-> Cu(NO3)2 + Ag2SO4
      The colour of precipitate is light blue.
    • AgNO3 and Na2CO3
      Silver Nitrate and Sodium Carbonate react to form Sodium Nitrate and Silver Carbonate. The precipitate is Silver Carbonate.
      AgNO3 + Na2CO3 -> Na2CO3 + Ag2CO3↓
      Precipitate’s colour is light Green.
    • AgNO3 and FeCl3
      Iron Nitrate and Silver Chloride are produced when Silver Nitrate reacts with Iron(III) Chloride.
      AgNO3 + FeCl3-> Fe(NO39 + AgCl3↓
      The precipitate colour was light Yellow.
    • Reactions with Lead (II) Nitrate
      Potassium nitrate and Lead Iodide
      are formed when Lead (II) Nitrate
      react with Potassium Iodide .
      The precipitation is Lead Iodide.
      Pb(NO3)2 + 2KI -> 2KNO3 + PbI2
      The precipitation’s colour is Yellow.
    • Pb(NO3)2 and NaCl
      When Lead (II) Nitrate react with
      Sodium Chloride it produced
      Sodium Nitrate and
      Lead (II) chloride.
      Pb(NO3) + 2NaCl ->2NaNO3 + PbCl2
      The precipitation has got white colour.
    • Pb(NO3)2 and KNO3
      When Lead (II) Nitrate and
      Potassium Nitrate react with
      each other it produced
      equal products as reactants
      because Potassium take
      place of Lead and Lead takes
      place of Potassium so it produced same.
      Pb(NO3)2 + KNO3 -> KNO3 + PbNO3
      The precipitate’s colour
      is transparent white.
    • Pb(NO3)2 and Na2CO3
      When Lead (II) Nitrate and
      Sodium Carbonate it
      produced Sodium Nitrate
      and Lead Carbonate as a precipitate.
      Pb(NO3)2 + Na2CO3 -> Na2NO3 + PbCO3
      The precipitate has got Whitecolour.
    • Pb(NO3)2 and NaOH
      Sodium Nitrate and Lead (II) Hydroxide are formed when Lead (II) Nitrate and Sodium Hydroxide react with each other.
      Pb(NO3)2 + 2NaOH -> 2NaNO3 + Pb(OH)2
      The precipitation has got a white colour.
    • In all the reactions Silver was a precipitate because Silver is a solid and don’t mix in solution and left in the bottom of the test tube.
      The two cations which form precipitate are Iodine and Chloride.
      Conclusion
    • Remember this one prohibited to drink any of the products that we have used.
    • Thanks for yourattention