Save
...
INORGANIC 2
PERIODICITY
REACTIONS OF METAL OXIDES
Save
Share
Learn
Content
Leaderboard
Share
Learn
Created by
Jasmine Singh
Visit profile
Cards (4)
REACTIONS OF BASIC METAL OXIDES AND WATER?
Na2O
(
s
) +
H2O
(
l
) ->
2Na+
(
aq
) +
2OH-
(
aq
)
strongly alkaline
solution formed
pH
14
MgO
(
s
) +
H2O
(
l
) ->
Mg(OH)2
(
s
) ⇋
Mg
(
2+
) (
aq
) +
2OH-
(
aq
)
sparingly soluble
in
water
somewhat alkaline
solution formed
pH
9
WHY DOES IT OCCUR?
O
(
2-
)
ion
is a
strong base
attracts H+
readily react
to produce
OH-
but
MgO less alkaline
solution as it is
less soluble
REACTIONS OF INSOLUBLE METAL OXIDES AND WATER?
Al2O3
no
reaction as
bonding too strong
to
separate ions
SiO2
no
reaction as it is
giant macromolecule
REACTIONS OF ACIDIC METAL OXIDES AND WATER?
P4O10
(
s
) +
6H2O
(
l
) ->
4H3PO4
(
l
)
H3PO4
(
aq
) ⇋
H+
(
aq
) +
H2PO4-
(
aq
)
phosphorus pentoxide
reacts
violently
with
water
produces
phosphoric acid
solution
which then
ionises
SO2
(
g
) +
H2O
(
l
) ->
H2SO3
(
aq
)
H2SO3
(
aq
) ⇋
H+
(
aq
) +
HSO3-
(
aq
)
fairly soluble
produces
sulfuric
(
IV
)
acid
solution
which then
partially dissociates
SO3
(
g
) +
H2O
(
l
) ->
H2SO4
(
aq
) ->
H+
(
aq
) +
HSO4-
(
aq
)
reactions
violently
produces
sulfuric
(
VI
)
acid
solution
REACTIONS WITH ACIDS AND ALKALIS?
Na2O
reacts with
acids
to produce
salt
and
water
MgO
reacts with
acids
to produce
salt
and
water
Al2O3
amphoteric
reacts with
both
acids
and
alkalis
SiO2
reacts with
weak acids
as a
strong base
e.g.
SiO2
(
s
) +
CaO
(
l
) ->
CaSiO3
(
l
)
P4O10
reacts with
alkali
in
multiple stages
e.g.
3NaOH
(
aq
) +
H3PO4
(
aq
) ->
Na3PO4
(
aq
) +
3H2O
(
l
)
SO2
reacts with
alkali
if itself is an
aqueous solution
also reacts to
remove flue gases
(
CaO
(
s
) +
SO2
(
g
) ->
CaSO3
(
s
))
