Displacement Reactions Lets look at the reaction between chlorine and potassium bromide When chlorine is bubbled through potassium bromide solution colourless the liquid turns redbrown because bromine forms ID: 474861
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Slide1
Displacement ReactionsSlide2
Displacement Reactions
Lets look at the reaction between chlorine and potassium bromide
When chlorine is bubbled through potassium bromide solution (colourless), the liquid turns red-brown, because bromine forms.The reaction is:
Cl2(g)
Br2(g)
2KBr(aq)
2KCl(aq)Slide3
Displacement Reactions
Bromine has given up electrons to chlorine.
The bromine has been oxidized and the chlorine has been reduced.The Ionic Equation is:
Cl2(g)
2Br
-(aq
)2Cl
-(
aq)
Br
2(g)Slide4
Displacement Reactions
In effect chlorine has pushed bromine out of the potassium compound and taken its place.
It has displaced bromine.Redox reactions like these, where one element displaces another from a dissolved compound (solution), are called displacement reactions.Slide5
Displacement of One Metal by Another.
An iron nail is placed in copper II
sulfate solution.Soon copper appears on the nail and the solution turns green.Here iron and copper are competing to be the compound in solution. Iron wins.
It displaces copper from copper II sulfate solution. A green iron II sulfate solution is formed.Slide6
The Equation
Fe
(s)
Cu
(s)CuSO
4(aq)
FeSO
4(
aq)
Blue
Green
the ionic equation is:
Fe
(s)
Cu
(s)
Cu
2+
(
aq
)
Fe
2+
(
aq
)Slide7
Displacement Reactions
Other metals displace less reactive metals in the same way.
A metal will always displace a less reactive metal from solutions of its compounds.When copper wire is placed in silver nitrate solution, the solution turns blue and crystals of silver form on the wire.Which metal is more reactive?Slide8
Remember the Activity Series
Potassium > Sodium > Lithium > Calcium > Magnesium > Aluminium > Zinc > Iron > Lead > (
hydrogen) > Copper > Silver > GoldCopper is more reactive.
Cu(s)
Ag(s)
AgNO3(aq)
Cu(NO
3
)
2(
aq
)Slide9
Try This….
What would you see if you added zinc to copper
sulfate solution?Hint zinc sulfate is colourless.Slide10
Now Try This……
Tin does not react with iron II oxide. But it reduces lead II oxide to lead.
Arrange tin, iron and lead in order of decreasing reactivity.Iron > tin > leadSlide11
Displacement of Hydrogen
Some metals will react with dilute acid.
These metals displace Hydrogen from the acid.
Mg(s)
H2(g)
HCl(aq)
MgCl
2(
aq
)