Maximum Concentrations Using Ksp

Question

Barium hydroxide (Ba(OH)₂) has a K_sp of 2.55x10^-4 at 25 ^oC. Using an ICE / RICE table, answer the following: 

 

Give your answers to the nearest 0.000 1 M. 

The maximum concentration of OH- ions in solution is1?

The maximum concentration of Ba2+ ions in solution is?

Answer 1

Ba(OH)₂(s) <===> Ba²⁺(aq) + 2OH^-(aq)

0................................0...................0..........I

.................................+x.................+2x.......C

..................................x..................2x.........E

Ksp = [Ba2+]{OH-]²

2.55x10^-4 = (x)(2x)² = 4x³

x³ = 6.375x10^-5

x = 0.040

[OH-] = 0.080 M

[Ba²⁺] = 0.040 M