Gen Chem Question

[Queen Beach]

What is the pH of a saturated solution of KOH given Ksp=1.6 x 10^-13?

a. 4.6
b. 6.4
c. 7.6
d. 8.3
e. 12.8

I picked C, but the back has E with an explanation that has C as it's answer. What do you think?

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[I-hate-alginate]

Then it's C.

 

[Valcandoit]

C