Calculating pH of Aqueous Solution

Explanation

The question asks for the pH of an aqueous solution containing 1.35E-8 M hydroxide ion at 25°C. To find the pH, we can use the relationship between hydroxide ion concentration ([OH-]) and pH. Since water is a neutral solution, it has equal concentrations of hydrogen ions ([H+]) and hydroxide ions ([OH-]). This means that the concentration of hydrogen ions will also be 1.35E-8 M. We can calculate the pH of this solution using the formula pH = -log[H+].

pH = -log(1.35E-8) = 7.87

Therefore, the pH of the solution is 7.87.

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