Which of the Following Has the Highest Concentration of Hydroxide

Question

Which of the following has the highest concentration of hydroxide ions?
A) pH 1
B) pH 14
C) pH 7
D) pH 10
E) pH 2

Accepted Answer

pH 14 has the highest concentration of hydroxide ions because it is the most basic or alkaline solution. At pH 14, the concentration of hydroxide ions (OH-) is 10^-14 moles per liter, which is the highest concentration among the choices given. In contrast, a solution with pH 1 is highly acidic and has a very low concentration of hydroxide ions.