At 25°C,the dissociation constant of a base, BOH, is 1.0 x 1... | Chemistry | SolveeIt | Solveeit

Today, August 19

Question

At 25°C,the dissociation constant of a base, BOH, is 1.0 x 10-12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be:

A

1.0 x 10-6 mol L-1

B

1.0 x 10-5 mol L-1

C

1.0 x 10-8 mol L-1

D

1.0 x 10-7 mol L-1

Answer

1.0 x 10-7 mol L-1

Explanation

Solution

BOH ⇌ B+ +OH-

Kb = $\frac{[B^+][OH^-]}{[BOH]}$

$\therefore$ 1×10-12 = 0.01 [OH- ]2

( $\because$ [OH- ]=[B+ ])

$\therefore$ [OH- ]2 =10−14

$\therefore$ [OH- ] =10−7

M $\Rightarrow$ 1.0×10-7 mol L-1

Therefore, the correct option is (D): 1.0×10-7 mol L-1