Ch_322a_3.08

Ch_322a_3.08 - a values) automatically provides a relative...

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Predicting Base Strengths H -A + B: acid base B: H + A: conjugate acid conjugate base - - According to the Bronsted-Lowry definitions of acids and bases, and the conjugate pairs are: H -A A: / and B: / B: H - - An important relationship between acids and their conjugate bases is: K a x K b = K w = 1.0 x 10 -14 pK a + pK b = 14 where K a is the acidity constant of an acid, and K b is the basicity constant of its conjugate base defined as A: - + H 2 O A:H + HO - K b Because of this intrinsic relationship between acids and their conjugate bases, the relative order of acid strengths (pK
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Unformatted text preview: a values) automatically provides a relative order of the strengths of the conjugate bases . Predicting Base Strengths bases CH 3 CO 2-HO-NH 2-CH 3 CH 2-conjugate acids CH 3 CO 2 H HOH NH 3 CH 3 CH 3 pK a values 4.75 15.7 38 >50 acid strengths predicted base strengths Predicting Base Strengths CH 3 NH 3 + methylaminium ion C 6 H 5 NH 3 + anilinium ion acids conjugate bases CH 3 NH 2 C 6 H 5 NH 2 methylamine aniline pK a 10.6 4.6 acid strengths predicted base strengths...
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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Ch_322a_3.08 - a values) automatically provides a relative...

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