Question

Calculate the pH of a sample of lake water that has a [H3O+] = 7.6 × 10−5 M.

Answer 1

Task:

Calculate the pH of a sample of lake water that has a [H₃O⁺] = 7.6×10⁻⁵ M.

Solution:

The pH is calculated using the expression:

pH = - log [H₃O⁺]

The hydronium ion (H₃O⁺) concentration is 7.6×10⁻⁵ M. Thus:

pH = -log[7.6×10⁻⁵] = 4.12.

Answer: pH = 4.12.