Ch18 Amines(pdf) - KFUPM Open Courseware
Ch18 Amines(pdf) - KFUPM Open Courseware
Ch18 Amines(pdf) - KFUPM Open Courseware
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Basicity Constant (K b ) and pK bK b is the equilibrium constant for the reaction:R 3 N • + H OH••••R 3 N +H+– •• OH••••K a and pK a of Conjugate AcidK a is the equilibrium constant for the dissociationof the conjugate acid of the amine:R 3 N +H R 3 N • + H +K b =[R 3 NH + ][HO – ][R 3 N]K a =[R 3 N][H + ][R 3 NH + ]andpK b = - log K bandpK a = - log K aRelationships between acidity and basicity constantsK a K b = 10 -14pK a + pKpb = 14Determining the Basicity of <strong>Amines</strong>
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