Question

The pH of a 0.001 M HCl solution is ___________

• A. 10
• B. 3
• C. 2
• D. 11

Hint:

When dealing with strong acids like HCl, the concentration of hydrogen ions \([H^+]\) is equal to the concentration of the acid, allowing for straightforward pH calculations using \(-\log [H^+]\).

Answer 1

The Correct Option is C

The pH of an acidic solution can be calculated using the formula: \[ pH = -\log [H^+] \] Given a hydrochloric acid (HCl) concentration of 0.001 M: \[ pH = -\log \left( 1 \times 10^{-3} \right) = 3 \] Hence, the correct answer is (C) 3.