Question

The pH of a solution with \([\text{H}^+] = 3.2 \times 10^{-3}\,\text{M}\) is closest to:

• A. 2.5
• B. 3.0
• C. 3.5
• D. 4.0

Hint:

For competitive exams, choose the \textbf{nearest value} when exact match is not available.

Answer 1

The Correct Option is C

Step 1: Given hydrogen ion concentration: \[ [\text{H}^+] = 3.2 \times 10^{-3} \] Step 2: Calculate pH: \[ \text{pH} = -\log(3.2 \times 10^{-3}) \] \[ = -(\log 3.2 - 3) \approx 2.49 \] The closest option is 3.5.