The degree to which a weak base dissociates is given by the base-ionization constant, Kb. For…

The degree to which a weak base dissociates is given by the
base-ionization constant, Kb. For the generic
weak base, B
B(aq)+H2O(l)⇌BH+(aq)+OH−(aq)
this constant is given by
Kb=[BH+][OH−][B]
Strong bases will have a higher Kb value. Similarly,
strong bases will have a higher percent ionization
value.
Percent ionization=[OH−] equilibrium[B] initial×100%
Strong bases, for which Kb is very large, ionize
completely (100%). For weak bases, the percent ionization changes
with concentration. The more dilute the solution, the greater the
percent ionization.
Ammonia, NH3, is a weak base with a Kb value of
1.8×10−5.
Part A
What is the pH of a 0.185 M ammonia solution?
Express your answer numerically to two decimal places.
Hints

pH =

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Part B
What is the percent ionization of ammonia at this
concentration?
Express your answer with the appropriate units.
Hints

% ionization =

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