The K_sp of Ca(OH)₂ Is 5 $\times$ 10^-5 at 25 ^$\circ$

Multiple Choice

The K_sp of Ca(OH) ₂ is 5.5 $\times$ 10^-5 at 25 ^$\circ$ C.What is the concentration of OH^-(aq) in a saturated solution of Ca(OH) ₂(aq) ?

A) 1.9 $\times$ 10^-3 M
B) 7.4 $\times$ 10^-3 M
C) 2.4 $\times$ 10^-2 M
D) 4.0 $\times$ 10^-2 M
E) 4.8 $\times$ 10^-2 M