If the concentration of OH- in a sample of seawater is 2.0x10-6 M, then calculate the concentration of H3O and the pH. Classify the solution as acidic, basic, or neutral.

[H₃O⁺] = 5.0 × 10⁻⁹ M

pH = 8.3

Basic

Explanation:

The concentration of OH⁻ in a sample of seawater is 2.0 × 10⁻⁶ M.

We can find the concentration of H₃O⁺ using the following expression.

[H₃O⁺] × [OH⁻] = Kw = 1.0 × 10⁻¹⁴

[H₃O⁺] = 1.0 × 10⁻¹⁴ / [OH⁻]

[H₃O⁺] = 1.0 × 10⁻¹⁴ / 2.0 × 10⁻⁶

[H₃O⁺] = 5.0 × 10⁻⁹ M

The pH is:

pH = -log [H₃O⁺]

pH = -log 5.0 × 10⁻⁹

pH = 8.3

Since pH > 7, the solution is basic.

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