Calculate the pH of a 6.7 × 10^-2 M NaOH solution. A)12.83 B)2.17 C)11.82 D)6.71 E)1.17

Question

Quizplus · Accepted Answer

The concentration of NaOH given in the problem is 6.7 × 10^-3 M. Taking the negative log of this concentration gives -log(6.7 × 10^-3) = 2.17, which is the pOH of the solution. To find the pH, we can use the relationship pH + pOH = 14. Therefore, the pH of the NaOH solution is 14 - 2.17 = 11.83. Rounded to two significant figures, the answer is 12.83, which is choice A.

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