Question
At 25∘C, the dissociation constant of a base BOH is 1.0 × 10−12. The
concentration of Hydroxyl ions in 0.01 M aqueous solution of the base
would be
concentration of Hydroxyl ions in 0.01 M aqueous solution of the base
would be
Answer: Option D
:
D
BOH⇋B++OH−
Initially,
BOH=C, B+ = 0 and OH− = 0
At Equilibrium
BOH=C−Cα, B+ = Cα and OH− = Cα
Kb=C2α2C(1−α) = Cα2assuming α<<1; 1−α∼ 1
10−12 = 10−2×α2; α2 = 10−10; α= 10−5
OH− = Cα = 0.01×10−5=10−7
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:
D
BOH⇋B++OH−
Initially,
BOH=C, B+ = 0 and OH− = 0
At Equilibrium
BOH=C−Cα, B+ = Cα and OH− = Cα
Kb=C2α2C(1−α) = Cα2assuming α<<1; 1−α∼ 1
10−12 = 10−2×α2; α2 = 10−10; α= 10−5
OH− = Cα = 0.01×10−5=10−7
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