Question

What is the pH of a solution with a 3.8 × 10−4 M hydronium ion concentration?

Answer 1

Answer:

3.4

Explanation:

The pH scale is used to express the acidity or basicity of a solution.

• If the pH < 7, the solution is acid.

• If the pH = 7, the solution is neutral.

• If the pH > 7, the solution is basic.

Given the hydronium ion concentration [H₃O⁺] = 3.8 × 10⁻⁴ M, we can calculate the pH using the following expression.

pH = -log [H₃O⁺]

pH = -log 3.8 × 10⁻⁴

pH = 3.4

This solution is acid.