Calculate the pH of a 0.005 M solution of potassium oxide,K₂O. A)12.0 B)11.7 C)7.0 D)2.3 E)2.0

Question

Quizplus · Accepted Answer

Potassium oxide (K2O) reacts with water to form potassium hydroxide (KOH), a strong base. The reaction is K2O + H2O -> 2KOH. Since KOH fully dissociates in water, the concentration of OH- ions will be twice that of the original K2O, making it 0.01 M. Using the formula pOH = -log[OH-], we find pOH = 2. Then, since pH + pOH = 14, the pH is 12.

Calculate the PH of a 0