Chemistry Reference
In-Depth Information
Note that this net ionic equation is
not
the same as the one for the reaction of
a strong acid and a strong base!
Practice Problem 9.4
Write a net ionic equation for the reaction of
aqueous
NH
3
with aqueous
HNO
3
.
EXAMPLE 9.5
Reaction of excess with 1 mol of NaOH(aq) produces 55.2 kJ of
heat. How much heat is liberated when 1 mol of
HClO
4
(aq)
Ba(OH)
2
(aq)
is treated with
excess
HClO
4
(aq)?
How can we tell?
Solution
The same net ionic equation describes both reactions:
H
OH
£ H
2
O
Because 55.2 kJ of heat is liberated per mole of water formed, as shown by the
NaOH reaction, the same quantity of heat is produced
per mole
of water formed
by the
Ba(OH)
2
.
Thus
2 mol
55.2 kJ/mol
110 kJ
is produced.
Practice Problem 9.5
Explain why 1 mol of NaOH plus excess
does
not
produce 55.2 kJ of heat.
HC
2
H
3
O
2
EXAMPLE 9.6
Write seven total equations corresponding to the following net ionic equation:
OH
(aq) £ F
(aq)
HF(aq)
H
2
O(
/
)
Solution
Any soluble, ionic hydroxide may be used. We know that barium hydroxide (to
a limited extent) and the six alkali metal hydroxides are soluble:
HF(aq)
LiOH(aq)
£ LiF(aq)
H
2
O(
/
)
HF(aq)
NaOH(aq)
£ NaF(aq)
H
2
O(
/
)
HF(aq)
KOH(aq)
£ KF(aq)
H
2
O(
/
)
HF(aq)
RbOH(aq)
£ RbF(aq)
H
2
O(
/
)
HF(aq)
CsOH(aq)
£ CsF(aq)
H
2
O(
/
)
HF(aq)
FrOH(aq)
£ FrF(aq)
H
2
O(
/
)
2 HF(aq)
Ba(OH)
2
(aq) £ BaF
2
(aq)
2 H
2
O(
/
)
