Final answer:
The pH of an air-saturated water solution with a hydronium ion concentration from dissolved CO2 of 2.0 × 10^-6 M at 25 °C is approximately 5.7.
Step-by-step explanation:
The student is asking about the relative attractions of different carbon-containing species to water molecules and to calculate the pH of a solution containing dissolved carbon dioxide at a given temperature. To answer the pH part: given that air-saturated water has a hydronium ion concentration (H3O+) caused by the dissolved CO2 of 2.0 × 10-6 M, you can calculate pH using the equation pH = -log[H3O+].
Inserting the values:
pH = -log(2.0 × 10-6)
≈ 5.7
Therefore, the pH of the solution is approximately 5.7.