Dolbier HW Solutions 511

Dolbier HW Solutions 511 - 605 AMINES 22.4 The...

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AMINES 605 22.4 The electron-donating amino group and the electron-withdrawing nitro group are directly conjugated in p -nitroaniline. The planar geometry of p -nitroaniline suggests that the delocalized resonance form shown is a major contributor to the structure of the compound. 22.5 The p K b of an amine is related to the equilibrium constant K b by p K b 52 log K b The p K b of quinine is therefore p K b log (1 3 10 2 6 ) 5 6 the values of K b and p K b for an amine and K a and p K a of its conjugate acid are given by K a 3 K b 5 1 3 10 2 14 and p K a 1 p K b 5 14 The values of K a and p K a for the conjugate acid of quinine are therefore K a 55 5 1 3 10 2 8 and p K a 5 14 2 p K b 5 14 2 6 5 8 22.6 The Henderson Hasselbalch equation described in Section 19.4 can be applied to bases such as amines, as well as carboxylic acids. The ratio [CH 3 NH 3 1 ] y [CH 3 NH 2 ] is given by 5 The ionization constant of methylammonium ion is given in the text as 2 3 10 2 11 . At pH 5 7 the hydrogen ion concentration is 1
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This note was uploaded on 10/03/2011 for the course CHM 2210 taught by Professor Reynolds during the Fall '01 term at University of Florida.

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