What is the pH of a 0.0035 M KOH solution?

Name: What is the pH of a 0.0035 M KOH solution?
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Question

Quizplus · Accepted Answer

KOH is a strong base, which means it will completely ionize in water. The equilibrium reaction is: 
KOH + H2O -> K+ + OH- + H2O 
Since KOH is 0.0035 M, the concentration of OH- is also 0.0035 M. To find the pH, we use the equation: 
pH = 14 - pOH 
pOH = -log [OH-] 
pOH = -log (0.0035) = 2.46 
pH = 14 - 2.46 = 11.54 
Therefore, the pH of the solution is 11.54, which is choice D.

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