Question

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

• A. 3
• B. 4
• C. 5
• D. 6

Hint:

Remember: pH is calculated using the formula \( \text{pH} = -\log[\text{H}^+] \).

Answer 1

The Correct Option is A

Provided: The molar concentration of hydrogen ions is \( [\text{H}^+] = 1 \times 10^{-3} \, \text{mol/L} \). Procedure: Step 1: Apply the pH formula The pH is determined by the equation: \[ \text{pH} = -\log[\text{H}^+] \] Step 2: Insert the specified concentration Substitute \( [\text{H}^+] = 1 \times 10^{-3} \) into the equation: \[ \text{pH} = -\log(1 \times 10^{-3}) = 3 \] Conclusion: The accurate result is option (1): 3.