What is the pH of a 0.0500 M NaOH solution?

Question

Quizplus · Accepted Answer

NaOH is a strong base, which completely dissociates in water to produce hydroxide ions (OH-).

The equation for this reaction is: 
NaOH --> Na+ + OH-

Since the concentration of NaOH is 0.0500 M, the concentration of OH- ions is also 0.0500 M.

The pH of a solution is defined as the negative logarithm (base 10) of the hydrogen ion (H+) concentration. However, in this case we have hydroxide ions (OH-), so we need to use the pOH formula to calculate the pH.

pOH = -log[OH-] 
pOH = -log[0.0500] 
pOH = 1.30

The pH of the solution can be found by using the equation: 
pH + pOH = 14

pH + 1.30 = 14 
pH = 12.7

Therefore, the pH of a 0.0500 M NaOH solution is 12.7. The correct answer is C.

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