Calculate the pH of a 0.02 M solution of KOH.
A)1.7
B)15.7
C)14.0
D)12.3
E)cannot calculate answer unless a volume is given

Question

Quizplus · Accepted Answer

KOH is a strong base, it dissociates completely in water to produce OH- ions. So, the concentration of OH- ions is 0.02 M. Using the formula pH = -log[OH-], we get pH = -log(0.02) which is approximately 1.3. However, since the question asks for pH and not pOH, we need to subtract this value from 14 to get pH = 14 - 1.3 = 12.3. Therefore, the answer is D.

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