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F-17
EXPERIMENT F - Extra Report Questions
(Not to be marked, however, useful for studying for the quiz)
1.
The
H
rxn
for the equilibrium I
2(aq)
+ I
-
(aq)
I3
-
(aq)
is approximately –19.0 kJ
(a) If the ambient temperature is less than 25 C, would you expect the experimental value calculated
for K
eq
to be greater or lower than the literature value of 1.00 x 10² at 25
C? Explain your
answer.
Hint:Use your observations from the cobalt equilibrium in experiment E to help you understand
the effect of temperature on the equilibrium constant.
(b)
Is the variation of your experimentally determined value of K
eq
consistent with the literature value,
taking into account the temperature at which you performed the experiment? Explain.
2.
In this experiment, the equilibrium constant, K
eq
, was carried out using a water/ dichloromethane
mixture for the aqueous equilibrium I
2(aq)
+ I
-
(aq)
I3
-
(aq)
. If we were able to do the same
experiment, only using water (i.e. without using dichloromethane), would we expect the same K
eq
value for the aqueous equilibrium I
2(aq)
+ I
-
(aq)
I3
-
(aq)
. Explain.
