Question

What is the pH of a solution with a hydrogen ion concentration of \(1 \times 10^{-4}\) mol/L?

• A. 3
• B. 4
• C. 5
• D. 6

Hint:

Use \( \text{pH} = -\log[H^+] \) directly when hydrogen ion concentration is in the form \(10^{-n}\). The pH will be simply \(n\).

Answer 1

The Correct Option is B

The pH of a solution is calculated using the formula: \[ \text{pH} = -\log[H^+] \] Given: \[ [H^+] = 1 \times 10^{-4} \] \[ \text{pH} = -\log(1 \times 10^{-4}) = 4 \] So, the solution has a pH of 4, indicating it's acidic.