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# Equilibrium Constant for an Acid-Base Reaction

CHEM-607HFH

What is the equilibrium constant for the reaction in which ammonia ($K_b = 1.8\times { 10 }^{ -5 }$) is titrated with hydrochloric acid?

A

$1.8\times { 10 }^{ -5 }$

B

$5.6\times { 10 }^{ -10 }$

C

$5.6\times { 10 }^{4 }$

D

$1.8\times { 10 }^{9 }$