Question

What is the pH of a solution with [H\(^+\)] = 10\(^{-3}\) M?

• A. 3
• B. 7
• C. 10
• D. 11

Hint:

pH is the negative base-10 logarithm of the hydrogen ion concentration.

Answer 1

The Correct Option is A

The pH is calculated as:
\[ \text{pH} = -\log_{10} [\text{H}^+] \] Given \([\text{H}^+] = 10^{-3} \, \text{M}\): \[ \text{pH} = -\log_{10} (10^{-3}) = -(-3) = 3 \] Thus, option (1) is correct.