What is the hydroxide ion concentration of a lye solution that has a pH of 9.20? A)6.3 × 10^-¹⁰ mol L^-1 B)1.6 × 10^-⁵ mol L^-1 C)4.8 mol L^-1 D)9.2 mol L^-1

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Quizplus · Accepted Answer

The pH of a solution is defined as the negative logarithm (base 10) of the hydrogen ion concentration. pH = -log[H+]. The pOH of a solution is defined as the negative logarithm (base 10) of the hydroxide ion concentration. pOH = -log[OH-]. The sum of pH and pOH is always equal to 14. pOH = 14 - pH = 14 - 9.20 = 4.80. Now, we can use the equation [OH-] = 10^-pOH. [OH-] = 10^-4.80 = 1.6 × 10^-5 mol L^-1. Therefore, the hydroxide ion concentration of the lye solution is 1.6 × 10^-5 mol L^-1. Hence, the correct choice is B.

What Is the Hydroxide Ion Concentration of a Lye Solution