What is the pH of a solution of the strong base NaOH?

Answer and explanation

Correct answer: D. 12

  1. Step 1: Sodium hydroxide () is a strong base that dissociates quantitatively in aqueous solution, yielding .
  2. Step 2: Compute the hydroxide potential: .
  3. Step 3: At , water equilibrium requires . Subtracting gives .
Answer
12.
Why not the others: 9 corresponds to ; 16 is an impossible pH above 14 for this concentration; 2 is the before subtracting from 14.

Practise more Ionic equilibrium.

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