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WOLFRAM|DEMONSTRATIONS PROJECT

Carbon Dioxide Sublimation and Dissolution Equilibria

​
temperature T (°C)
25.5
moles of
CO
2
(n)
1
General
:4.10071×
-134
10
6.72632×
-267
10
is too small to represent as a normalized machine number; precision may be lost.
In this Demonstration, you can manipulate the number of moles of
CO
2
(
n
) and the temperature
T
(°C) to visualize both the equilibria of sublimation of solid
CO
2
and the dissolution of gaseous
CO
2
into aqueous solution. In the graphic, the left cylinder shows the sublimation of
CO
2
, beginning with solid
CO
2
. The equilibrium depends on the number of moles and the temperature. In the right cylinder, the dissolution of gaseous
CO
2
depends both on the Henry's law constant
k
H
(T)
and the ideal gas law (
PV=nRT
). On the right is a bar graph comparing the values of
Q
, the reaction quotient, and
K
, the equilibrium constant.
Q
will change as the molar concentration of carbon dioxide changes, while
K
will only change with temperature. The visual comparison of
Q
and
K
shows the direction of the reaction. If
Q
is smaller than
K
, the forward reaction is favored, while if
Q
is larger than
K
, the reverse reaction is favored.
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