Question

What is the pH of a solution with a \( \text{H}^+ \) concentration of \( 1 \times 10^{-3} \, \text{mol/L} \)?

• A. 3
• B. 4
• C. 5
• D. 6

Hint:

Remember: The pH of a solution is the negative logarithm of the hydrogen ion concentration. A lower pH means more acidic.

Answer 1

The Correct Option is A

Step 1: Use the formula for pH The pH of a solution is given by the formula: \[ \text{pH} = -\log[\text{H}^+] \] where \( [\text{H}^+] \) is the concentration of hydrogen ions in the solution. Step 2: Substitute the given concentration Given: - \( [\text{H}^+] = 1 \times 10^{-3} \, \text{mol/L} \). Substitute this into the formula: \[ \text{pH} = -\log(1 \times 10^{-3}) = 3 \] Answer: Therefore, the pH of the solution is 3. So, the correct answer is option (1).