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Precipitation react2
 

Precipitation react2

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Precipitation reactions 4ESO

Precipitation reactions 4ESO

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    Precipitation react2 Precipitation react2 Presentation Transcript

    • Precipitation in Double Displacement Reactions Rimsha Mumtaz David Bazan
    • Introduction
      • A double displacement reaction involves the reaction of two compounds to form two new compounds. In effect, the compounds change partners with each other.
      • There are so many examples of double displacement reaction. For example: When Silver Nitrate react with Sodium Chloride produce Sodium Nitrate and Silver Chloride. This is a double displacement reaction.
    • Purpose, Material for these reactions.
      • The purpose of these reactions is to observe precipitation reactions by mixing aqueous solutions of cations and anions.
      • The material which we need are following:
      • Pb(NO 3 ) 2 AgNO
      • KI KNO 3
      • NaOH CaCl 2
      • Na 2 CO 3 NaCl
      • FeCl 3 CuSo 4
      • Test Tubes Test Rack
    • Procedure of these reactions
      • We have to put 21 test tubes in a test tube rack.
      • Add 6 drops of the solution indicated which are: KI,NaCl,NaOH,FeCl 3 ,KNO 3 ,Na 2 CO 3 , CuSO 4 .
      • Add 6 drops of AgNO 3 solution to every tube.
      • We have to observe and record information and color of precipitate formed .
      • Do the same with Pb(NO 3 ) 2 and with CaCl 2 .
      • Clean the test tubes and dispose of the wastes in the waste container.
      • And finally write correctly equations for all of the reactions where a precipitate is formed.
    • Reactions with AgNo 3
      • When we add a small quantity of Potassium Iodide in Silver Nitrate it produced Potassium Nitrate and as a precipitate produced Silver Iodide.
      • AgNO 3 + KI -> KNO 3 + AgI↓
      • Precipitate has got a Yellow colour.
    • AgNO 3 and NaCl
      • When we add a small quantity of Sodium Chloride in Silver Nitrate it produced Sodium Nitrate and as a precipitate formed Silver Chloride.
      • AgNO3 + NaCl -> NaNO3 + AgCl↓
      • Precipitate has got white colour.
    • AgNO 3 and NaOH
      • Silver Nitrate react with Sodium Hydroxide to form Sodium Nitrate and Silver Hydroxide as a precipitate .
      • AgNO 3 + NaOH -> NaNO 3 + AgOH↓
      • The precipitate's colour was Brown.
    • AgNO 3 and FeCl 3
      • Iron Nitrate and Silver Chloride are produced when Silver Nitrate react with Iron(III) Chloride .
      • AgNO 3 + FeCl 3 -> FeNO 3 + AgCl 3 ↓
      • The precipitate colour was light Yellow .
    • AgNO 3 and KNO 3
      • When Silver Nitrate and Potassium Nitrate react produced equal products Because Silver take place of Potassium and Potassium take place of Silver.
      • AgNO 3 + KNO 3 -> KNO 3 + AgNO 3
      • The precipitate was Semi Transparent.
    • AgNO 3 and Na 2 CO 3
      • Silver Nitrate and Sodium Carbonate react to form Sodium Nitrate and Silver Carbonate. The precipitate is Silver Carbonate.
      • AgNO 3 + Na2CO 3 -> Na 2 CO 3 + AgCO 3 ↓
      • Precipitate’s colour is light Green.
    • AgNO 3 and CuSO 4
      • Copper nitrate and Silver Sulphurate are form when Silver Nitrate and Copper Sulphurate react with each other. The precipitate is Silver Sulphurate.
      • AgNO 3 + CuSO 4 -> CuNO 3 + AgCO 3
      • The colour of precipitate is very light blue.
    • 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(NO 3 ) 2 + 2KI -> 2KNO 3 + PbI 2
      • The precipitation’s colour is Yellow.
    • Pb(NO 3 ) 2 and KI
      • When Lead (II) Nitrate react with Sodium Chloride it produced Sodium Nitrate and Lead (II) chloride.
      • Pb(NO 3 ) + 2NaCl ->2NaNO 3 + PbCl 2
      • The precipitation has got white colour.
    • Pb(NO 3 ) 2 and NaOH
      • Sodium Nitrate and Lead (II) Hydroxide are formed when Lead (II) Nitrate and Sodium Hydroxide react with each other.
      • Pb(NO 3 ) 2 + 2NaOH -> 2NaNO 3 + Pb(OH) 2
      • The precipitation has got a 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(NO 3 ) 2 + KNO 3 -> KNO 3 + PbNO 3
      • The precipitate’s colour is transparent white .
    • Pb(NO 3 ) 2 and Na 2 CO 3
      • When Lead (II) Nitrate and Sodium Carbonate it produced Sodium Nitrate and Lead Carbonate as a precipitate.
      • Pb(NO 3 ) 2 + Na 2 CO 3 -> Na 2 NO 3 + PbCO 3
      • The precipitate has got White colour.
    • Conclusion
      • The two cations which form most precipitates are Ag+ and Pb2+.
    • Thanks for your attention