What is the pH of a 0.00500 M solution of barium hydroxide?

Question

Quizplus · Accepted Answer

Barium hydroxide is a strong base, so it dissociates completely in water. The balanced equation for its dissociation is Ba(OH)2 -> Ba2+ + 2OH-. Since barium hydroxide has a concentration of 0.00500 M, the concentration of OH- is 0.0100 M. Taking the negative log of the OH- concentration gives the pOH, which is 1.00. Subtracting the pOH from 14 gives the pH, which is 13.0. Therefore, the correct answer is B) 12.0.

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