Stalactites-The Long, Icicle-Like Formations That Hang from the Ceilings of Caves-Are

Stalactites-the long, icicle-like formations that hang from the ceilings of caves-are formed from recrystallizing minerals such as calcite (calcium carbonate) . The K_sp of calcium carbonate is 4.5*10^-9. What is the concentration of a saturated calcium carbonate solution?

A) 0.00104 M
B) 4.5 *10^-9 M
C) 6.7 *10^-5 M
D) 2.25 *10^-9 M
E) 4.5 *10^-5 M