pH and Percent Ionization of a Weak Base The degree to which a weak base dissoci

Question

pH and Percent Ionization of a Weak Base

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

pH and Percent Ionization of a Weak Base

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

Explanation / Answer

NH3 + H2O <----> NH4+ + OH-

Kb = 1.8 x 10^-5 = x^2/ 0.175-x

x= sqt(3.15 x 10^-6)

x = 0.00177

% ionization = 0.00177 x 100/ 0.175 = 1.014

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