What is the hydroxide ion concentration of a lye solution that has a pH of 9.20? A) 6.31 × 10^-¹⁰ M B) 1.58 × 10^-⁵ M C) 4.80 M D) 9.20 M

Question

Quizplus · Accepted Answer

The pH of a solution is defined as the negative logarithm of the hydrogen ion concentration. Therefore, we can use the formula: pH + pOH = 14 to find the pOH of the solution. 
pOH = 14 - 9.20 = 4.80
The hydroxide ion concentration can be found by taking the antilogarithm of the pOH:
[OH-] = 10^(-pOH) = 1.58 × 10^(-5) M. 
Therefore, the best choice is B.

What Is the Hydroxide Ion Concentration of a Lye Solution