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 determined by the formula: \[ \text{pH} = -\log[H^+] \] The hydrogen ion concentration \[ [H^+] = 1 \times 10^{-4} \] This yields a pH calculation of \[ \text{pH} = -\log(1 \times 10^{-4}) = 4 \] Consequently, the solution exhibits a pH of 4, signifying an acidic nature.