Weak Base Calculations Part A Many common weak bases are derivatives of NH3 where one or more of the hydrogen atoms have been replaced by another substituent. Such reactions can be generically symbolized as f Kb, for NX is 4.0x10-6 what is the pOH of a 0.175 M aqueous solution of NX3? Express your answer numerically Hints NX(aq)H20HNXs (aq)OH (aq) where NX3 is the base and HNXs is the conjugate acid. The equilibrium-constant expression for this reaction is where K, is the base ionization constant. The extent of ionization, and thus the strength of the base, increases as the value of Kb increases. Submit My Answers Give Up Ka and Kb are related through the equation Part B Kb for NX is 4.0x10-6 what is the percent ionization of a 0.325 M aqueous solution of NX? Express your answer numerically to three significant figures As the strength of an acid increases, its Ka value increase and the strength of the conjugate base decreases (smaller Kb value). Hints percent ionization = Submit My Answers Give Up Part C K, for NXs is 4.0x10, what is the the pKa for the following reaction? Express your answer numerically to two decimal places Hints Submit My Answers Give Up
Many common weak bases are derivatives of NH3, where one or more of the hydrogen atoms have been replaced by another substituent. Such reactions can be generically symbolized as
NX3(aq)+H2O(l)âHNX3+(aq)+OHâ(aq)
where NX3 is the base and HNX3+ is the conjugate acid. The equilibrium-constant expression for this reaction is
Kb=[HNX3+][OHâ][NX3]
where Kb is the base ionization constant. The extent of ionization, and thus the strength of the base, increases as the value of Kb increases.
Ka and Kb are related through the equation
KaÃKb=Kw
As the strength of an acid increases, its Ka value increase and the strength of the conjugate base decreases (smaller Kb value).
Part A
If Kb for NX3 is 2.0Ã10â6, what is the pOH of a 0.175 M aqueous solution of NX3?
Express your answer numerically.
pOH =
3.23
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Part B
If Kb for NX3 is 2.0Ã10â6, what is the percent ionization of a 0.325 M aqueous solution of NX3?
Express your answer numerically to three significant figures.
percent ionization =
0.33
%
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Part C
If Kb for NX3 is 2.0Ã10â6 , what is the the pKa for the following reaction?
HNX3+(aq)+H2O(l)âNX3(aq)+H3O+(aq)
Express your answer numerically to two decimal places.
pKa =
8.54
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Not quite. Check through your calculations; you may have made a rounding error or used the wrong number of significant figures.