Final answer:
The titration of carbonate anion with water involves the dissolution of CO2 to form carbonic acid, which subsequently ionizes to yield bicarbonate and then carbonate ions. These reactions lead to a change in the pH of the solution.
Step-by-step explanation:
The chemical equation for the titration of carbonate anion (CO32-) with water can be understood by examining the reactions of dissolved carbon dioxide with water. When CO2 is dissolved in water, it forms carbonic acid (H2CO3), which then undergoes a series of acid-base reactions.
Relevant Chemical Equations
- Initial dissolution of CO2 in water: CO2 (aq) + H2O (l) = H2CO3 (aq)
- Ionization of carbonic acid to bicarbonate ion: H2CO3 ≈ H+ + HCO3-
- Further ionization of bicarbonate to carbonate ion: HCO3- H+ + CO32-
These reactions illustrate how dissolved carbon dioxide reacts with water, producing bicarbonate and carbonate ions, a process that can affect the pH of the solution. The overall process is essential for understanding the chemical behavior of carbonates in aqueous solutions.