A 49.9g sample of barium hydroxide octahydrate, `Ba(OH)_(2).8H_(2)O` is dissolved in water and the solution is diluted to give a final volune of 2.50L. What is the concentration of the hydroxide ion in this solution?`
A. 0.0634M
B. 0.127M
C. 0.190M
D. 0.634M
