The Ksp of Ca(OH)2 is 5.5 x 10-5 at 25 °C. What is the concentration of OH- (aq) in a saturated solution of Ca(OH)2(aq)?
(a) 1.9 x 10-3 M
(b) 7.4 x 10-3 M
(c) 2.4 x 10-2 M
(d) 4.0 x 10-2 M
(e) 4.8 x 10-2 M
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