What is the pH of a 0.0 40 mol L^-1 Ba(OH)₂ solution? A) 1.10 B) 1.40 C) 12.60 D) 12.90

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Quizplus · Accepted Answer

Ba(OH)2 is a strong base, dissociating completely in water to give Ba2+ and 2OH- ions. The molarity of this solution is 0.040 mol/L, which means there are 0.080 mol of OH- ions in the solution. To find the pH, we use the formula pH = 14 - pOH. pOH can be found using pOH = -log[OH-] = -log(0.080) = 1.10. Therefore, pH = 14 - 1.10 = 12.90. The correct choice is D.

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