Calculate the concentration of H3O + of a solution if the concentration of OH - at 25°C is 3.8 * 10-5 M and determine if the solution is acidic or basic.

[H₃O⁺] = 2.63*10⁻¹⁰ M

As pH = 9.57, the solution is basic

Explanation:

We must know this knowledge:

[OH⁻]. [H₃O⁺] = 1*10⁻¹⁴

3.8*10⁻⁵. [H₃O⁺] = 1*10⁻¹⁴

[H₃O⁺] = 1*10⁻¹⁴ / 3.8*10⁻⁵ → 2.63*10⁻¹⁰ M

Let's determine the pH to state if the solution is acidic or basic

pH 7 → basi

pH = - log [H₃O⁺]

pH = - log 2.63*10⁻¹⁰ → 9.57