Reaction of Group-2 metals with oxygen :
Hi
fellows!! This is Chemaddicts again to
the solution. Today, we will discuss about the reaction of Gr-2 metals with
oxygen.
So, let’s get started!!
Before going to
the discussion of the reaction of Gr-2 metals with oxygen, we need to clear the
confusion between the concept of burning metal
and metal ions .
Most of the
students mix up the concept of burning metals and metal ions.
This is because
most metals and metal ions in Gr-2 have same flame colour. There is a difference
and we will see today:
Today, we will discuss
the reaction of metals with oxygen gas:
All Gr-2 metals except Barium react with oxygen to give
metal oxides whereas Barium reacts with oxygen to give Barium
peroxide ( BaO2 ).
Equations for
the reactions:
Here Mg burns with bright white flames.
Here, in this
case , we are burning Mg not Mg ion .
This is the difference here. Mg2+ ion have no flame colour. Don’t write
the flame colour of Mg2+ ion
as Mg metal.
Other Group-2 metals
below Mg give the same colour as the metal cations. So, don’t get confused.
Here Ca burns with brick red flames like Ca2+ ions.
Here Calcium metal will give the same colour as the Ca2+ ion.
Here Strontium metal will give the same colour as the Sr2+ ion.
(Here Ba burns with apple green flames like Ba2+
ions. )
Here Barium
metal will give the same colour as the Ba2+ ion.
If you wanna have some other video tutorials, you will find them here:
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