...of HCO3- and CO32-, the following reactions occur:
* **HCO3- + H+ -> H2CO3**
* **H2CO3 -> CO2 + H2O**
The first reaction produces carbonic acid (H2CO3), which then decomposes into carbon dioxide (CO2) and water (H2O). The CO2 gas bubbles out of the solution, and the pH of the solution...