What is the pH of a 0.020 M KOH solution?
A)0.020
B)1.70
C)7.00
D)12.30
E)−1.70

Question

Quizplus · Accepted Answer

KOH is a strong base, which means it dissociates completely in water to produce OH- ions.

The concentration of OH- ions in a 0.020 M KOH solution is the same as the concentration of KOH, which is 0.020 M.

We can use the definition of pH to calculate the pH of the solution:

pH = -log[H+]

Since the solution contains no H+ ions, we need to use the concentration of OH- ions to calculate the pH:

pOH = -log[OH-] = -log(0.020) = 1.70

Using the relationship between pH and pOH:

pH + pOH = 14

pH = 14 - pOH = 12.30

Therefore, the pH of a 0.020 M KOH solution is 12.30.

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