Question

What is the pH of a 6.50 x 10-2 M NaOH solution?

6.5


12


1.18


12.82

Answer 1

12.82

Step-by-step explanation:

NaOH is a strong base as it contains an alkali metal (Na). When dealing with strong bases, the concentration of OH- is equal to the concentration of the strong base. So, [OH-] = 6.50 x 10^-2.

Using the concentration of OH-, you can find the pOH, by doing -log[OH-]:

-log(6.50 x 10^-2) = 1.187

Now that you have pOH, you can find pH by doing 14 - 1.187, as pH + pOH = 14.

14 - 1.187 = 12.813

The closest answer to this is option D, 12.82.