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Inorganic Chemistry
GROUP 2
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Naomi megastinker
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what is the trend of the solubility of Group 2 Hydroxides?
solubility
increases
down the group
what is the trend of the solubility of Group 2 Sulphates?
solubility
decreases
down the group
Soluble salts
Sr(OH)₂ + Ba(OH)₂
K₂CO₃ + NaCO₃
most SO₄²⁻
most Cl⁻ Br⁻ I⁻
All
NO₃
Insoluble Salts
most OH⁻
most CO32-
SrSO4 + BaSO4
AgCl AgBr AgI
Why does
Mg
react with
steam
not
water
?
The reaction with water is really so slow so we assume there was no reaction.
Equation for group 2 reacting with water:
M
(s) + 2H₂O(l) → M(
OH
)2(?) + H2(g)
What does the
reaction
with water depend on?
how easily the outer 2
electrons
are removed from the
metal
to form a 2+ ion
how soluble the
hydroxide
is
Mg
is an exception
Equation for Mg reacting with steam:
Mg(s) + H2O(g) →
MgO
(s) + H2(g)
What observations are made when reacting Mg with steam?
a
white bright light
and
white powder
What is Mg(OH)2 used in?
laxatives and antacids (neutralise
excess
acid in stomach)
What is Barium Sulphate used as in medicine?
a
contrast agent
to see internal organs more clearly in a
CT scan
or
X-ray examination
What is Calcium Sulphate used in?
used in agriculture to neutralise
acid
What gases are used to remove Sulphur dioxide from flue gases?
Calcium oxide
or
calcium carbonate
.
Equations for removing Sulphur dioxide using Calcium Oxide
CaO + SO2 →
CaSO3
CaSO3 + 1/2O2 →
CaSO4
removing Sulphur dioxide using Calcium Carbonate
CaCO3 + SO2 → CaSO3 +
CO2
CaSO3 + 1/2O2 →
CaSO4
What are acidified bases used for?
To test for
sulphate
ions
Equation
for extracting
Titanium
TiCl4
(g) + 2Mg(l) → Ti(s) + 2MgCl2(l)