If the pH of a solution is increased from pH 5 to pH 7, it means that the concentration of H⁺ is ________ than it was at pH 5.

Question

Quizplus · Accepted Answer

The pH scale is logarithmic, meaning each whole pH value below 7 is ten times more acidic than the next higher value. Increasing pH from 5 to 7 means the solution is becoming less acidic, thus the concentration of H+ ions is decreasing. For each pH unit increase, the H+ concentration decreases by a factor of 10. Therefore, moving from pH 5 to pH 7 (a change of 2 pH units) decreases the H+ concentration by 10^2, or 100 times.

If the PH of a Solution Is Increased from PH