One litre of a solution of pH 9 has how many more hydroxyl ions (OH⁻)than 1 L of a solution of pH 4?

Name: One litre of a solution of pH 9 has how many more hydroxyl ions (OH⁻)than 1 L of a solution of pH 4?
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Quizplus · Accepted Answer

The pH scale is logarithmic, so each unit change represents a tenfold change in ion concentration. A pH of 9 has a hydroxyl ion concentration of 10^-5 M, while a pH of 4 has a hydroxyl ion concentration of 10^-10 M. The difference is 10^5, or 100,000 times more hydroxyl ions.

One Litre of a Solution of PH 9 Has How