Iron Thiocyanate Equilibrium
1. Write the equilibrium constant expression for the following reaction.
Co2+(aq) + 4Cl(aq) CoCl
(aq)
2
4
In which direction will the equilibrium shift if [Co2+] is increased?
In which direction will the equilibrium shift if [CoCl42] is decreased?
2. Using Chatelier’s principle, predict the direction of the net reaction in each of the
following systems equilibrium systems as a result of increasing the pressure at
constant temperature (ie., decreasing the volume available to any gases.)
a.
N2(g) + O2(g) 2NO(g)
b.
PCl5(g) PCl
c.
Sn(s) + 2H+(aq) Sn
d.
CaO(s) + CO2(g) CaCO
(g) + Cl2(g)
3
(aq) + H2(g)
2+
(s)
3
3. Write equilibrium constant expressions for each of the systems given in question
2.
a.
b.
c.
d.
4. Explain the shifts you predicted in question 2 in terms on the equilibrium constant
expressions.
a.
b.
c.
d.
5. What effect (shift from the right or to the left) does an increased in temperature have
on each of the following systems at equilibrium? Explain.
a. 3O2(g) 2O
(g) D
H= 284 kJ
3
b. 2SO2(g) + O2(g)
D
H= 198 kJ
6. Complete the table below for the reaction,
Ni(s) + 4 CO(g) Ni(CO)
(g)
4
D
H < 0
Answering “‹”, “› ”, “fi
”, “fl ”, or “no change” after the perturbation is made.
What is the
effect on the
parameters on
the right after
the perturbation
below is made
e.g. argon is
added
More Ni is
added
More CO is
added
More Ni(CO)4
is added
T is increased
PCO
No change
PNi(CO)4
No change
equilibrium
No change
Note: ‹ shifts to the left, › increases, fi
shifts to the right, fl decreases.
KP
No change
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