Acid-Base Equilibria

  • Thread starter alingy1
  • Start date
  • #1
325
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Why is it that for the constant Kb, we always have to write H2O in the equation and we can omit H2O in acid reactions:

My textbook always writes:
NH3+H2O<=>NH4++OH-
NH4+<=>NH3+H+

Why can we not write NH3+H+<=>NH4+?
 

Answers and Replies

  • #2
Borek
Mentor
28,476
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Why can we not write NH3+H+<=>NH4+?
We can. NH4+ is a weak acid, with a dissociation constant of 5.6×10-10, and above dissociation reaction is perfectly valid.

Your book my be sticking to one convention to make things easier to follow.
 
  • #3
325
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Would the equilibrium constant be the same of that reaction? Or should we substitute OH- with Kw/H+?
Kw=10^-14
 
  • #5
325
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I guess this means yes. :)
 

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