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Ionic Equilibrum question

2005 · Q115
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Ionic Equilibrum question

2005 · Q115

NEETChemistryIonic EquilibrumMCQ+4 / −1
At 25oC, the dissociation constant of a base, BOH, is 1.0 ×\times× 10−-−12. The concentration of hydroxyl ions in 0.01 M aqueous solution of the base would be
  1. A
    1.0 ×\times× 10−-−5 mol L−-−1
  2. B
    1.0 ×\times× 10−-−6 mol L−-−1
  3. C
    2.0 ×\times× 10−-−6 mol L−-−1
  4. D
    1.0 ×\times× 10−-−7 mol L−-−1
View written solutionFree

Correct answer: D

BOH⇌B++OH-
InitiallyC00
At equilibbriumC - C$\alpha $C$\alpha $C$\alpha $


[OH-] = C$\alpha $

$ \Rightarrow $ [OH-] = $\sqrt {{K_b}C} $

$ \Rightarrow $ [OH-] = $$\sqrt {1 \times {{10}^{ - 12}} \times {{10}^{ - 2}}} $$

= 1.0 $ \times $ 10$-$7 mol L$-$1
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