What will be the molar concentration (M) of a solution of Sr(OH)2 which has a pH

equal to 12?

A) 0.1 M

B) 1 x 10-2 M

C) 1 x 10-12 M

D) 2 M

E) 5 x 10-3M

BTW (E) is the answer and i am not sure how to solve it…would be helpful if someone helped me out to solve it.