WOLFRAM NOTEBOOK

WOLFRAM|DEMONSTRATIONS PROJECT

CO
2

​
time (s)
0.
initial mass of dry ice block (mg)
90.
initial amount of water (mL)
100.
hydrogen ion concentration: 0.100×
-6
10
M
pH = 7.
CO
2
sublimation from dry ice is a well-known phenomenon, which occurs at standard temperature and pressure. If water is accessible to the gaseous
CO
2
, it will dissolve in the water. Carbonic acid and bicarbonate ions form in the sequence of chemical equilibria:
CO
2
+
H
2
O⇌
H
2
CO
3
⇌
+
H
+
-
HCO
3
Dissociation of the carbonic acid causes the pH of the water to decrease.
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