How many moles of pure NaOH must be used to prepare 1.0 L of a solution that has pH = 12.26? A) 8.2 * 10^-¹⁶mol B) 0.018 mol C) 5.5 * 10^-¹³mol D) 1.74 mol E) none of these

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Quizplus · Accepted Answer

To find the moles of NaOH needed to achieve a pH of 12.26, we first calculate the concentration of OH- ions because NaOH is a strong base and dissociates completely in water. The pOH is given by 14 - pH, which is 14 - 12.26 = 1.74. The concentration of OH- ions is then 10^(-pOH) = 10^(-1.74) ≈ 0.018 M. Since the volume of the solution is 1.0 L, the moles of NaOH required are 0.018 M * 1.0 L = 0.018 mol.

How Many Moles of Pure NaOH Must Be Used to Prepare