Solid calcium hydroxide is dissolved in water until the pH of the solution is 11.44.The hydroxide ion concentration [OH^-] of the solution is: A)3.6 $\times$ 10^-¹²M B)5.5 $\times$ 10^-³M C)2.8 $\times$ 10^-³M D)1.4 $\times$ 10^-³M E)none of these

Question

Quizplus · Accepted Answer

The pH of the solution indicates that it is basic. The pH can be converted to [OH-] using the formula: pH + pOH = 14.
pOH = 14 - 11.44 = 2.56
[OH-] = 10^-2.56 = 2.81 x 10^-3 M
Therefore, the hydroxide ion concentration [OH-] of the solution is 2.81 x 10^-3 M, which is closest to choice C (2.8 x 10^-3 M).

Solid Calcium Hydroxide Is Dissolved in Water Until the PH ×\times×

Solid Calcium Hydroxide Is Dissolved in Water Until the PH $\times$