Which of the following aqueous solutions is(are) considered acidic ?
I. A solution with [OH^-] = 2.5×10^{- 8}
II. A solution with [H₃O⁺] = 1×10^{- 7}
III. A solution with a pOH = 8

Question

Which of the following aqueous solutions is(are) considered acidic ? I. A solution with [OH^-] = 2.5×10^{- 8} II. A solution with [H₃O⁺] = 1×10^{- 7} III. A solution with a pOH = 8

Quizplus · Accepted Answer

To determine if a solution is acidic, we need to consider the concentration of hydrogen ions ([H+]) or the pOH value. For a solution to be acidic, its pH must be less than 7, or equivalently, its pOH must be greater than 7 (since pH + pOH = 14 at 25°C).I. A solution with [OH-] = 2.5×10^-8 M. To find if it's acidic, we need to calculate the pOH and then the pH. However, without doing the calculations, knowing that the [OH-] is low suggests it's not a basic solution, but we can't directly infer it's acidic without comparing it to the [H+].II. A solution with [H3O+] = 1×10^-7 M. This concentration of hydronium ions corresponds to a neutral solution at 25°C, as pure water has [H3O+] = 1×10^-7 M. However, any slight increase in [H3O+] would make the solution acidic, but based on this value alone, it's at the border between neutral and acidic.III. A solution with a pOH = 8. Since pOH + pH = 14, a pOH of 8 means the pH is 6, which is less than 7. Therefore, this solution is acidic.Given the information, the correct choices are I and III, as they are the ones that can be considered acidic based on the provided data.

Which of the Following Aqueous Solutions Is(are) Considered Acidic