50 ml of `H_(2)O` is added to `1 xx 10^(-3)`M barium hydroxide solution. What is the pH of the resulting solution?

Options

A. 3
B. 3.3
C. 11
D. 11.7

Answer

C

Explanation

Hydrolysis of barium hydroxide in water is as follows.
`Ba(OH)_(2) hArr Ba^(2+) + 2OH^(-)`
`[OH^(-)] = 2 xx [Ba(OH)_(2)]/2`
`pOH = -"log"[OH^(-)] = -"log"[1 xx 10^(-3)] = -(-3)"log"_(10) = 3`
pH = 14 - pOH = 14 - 3 = 11