Problem: Which of the following is the correct K b expression for the reaction below:B(aq) + H2O(l) ⇌ HB+(aq) + OH-(aq)A) Kb = [B][H2O]B) Kb = [HB+][OH-] / [B][H2O]C) Kb = [HB+][OH-] / [H2O]D) Kb = [HB+][OH-] / [B]E) Kb = [HB+][OH-]

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We are being asked to determine the correct Kb expression for the given reaction below:

Equilibrium reaction:        B(aq) + H2O(l)  HB+(aq) + OH-(aq)


Kb is the base dissociation constant and it is an equilibrium expression

When writing an equilibrium expression:

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Problem Details

Which of the following is the correct K b expression for the reaction below:
B(aq) + H2O(l) ⇌ HB+(aq)OH-(aq)

A) Kb = [B][H2O]

B) Kb = [HB+][OH-] / [B][H2O]

C) Kb = [HB+][OH-] / [H2O]

D) Kb = [HB+][OH-] / [B]

E) Kb = [HB+][OH-]

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