Multiple choice general knowledge science & technology The sum of pH value and pOH value of an aqueous solution is? 7.0 14.0 11.0 10.4 Reveal answer Fill a bubble to check yourself B Correct answer Explanation The sum of pH and pOH is always 14.0 at 25°C for any aqueous solution. This relationship comes from the water dissociation constant (Kw = [H+][OH-] = 1.0 × 10^(-14) at 25°C). It's a fundamental concept in acid-base chemistry.