L07 Chem 261 Study Guide - Quiz Guide: Arginine, Weak Base, Oa
13 Dec 2016
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Ka = keq[h2o] = [3+][ : a strong acid dissociates readily in water and has a very large ka, a weak acid does not dissociate readily in water and will have a small ka, pka = -log10ka. Pka values are typically in the range of -10 to 50 for molecules encountered in organic chemistry. A strong acid will have a small (negative) pka. A weak acid will have a large (positive) pka: definitions, pka = -log10ka, ph = -log10[h3o+, ph = pka when [a-] = [ha] 50% dissociation: if ph > pka, then [a-] > [ha] Ph is more basic than the pka of ha, then the conjugate base is the major species present: if ph < pka, then [a-] < [ha] Hcl and hydronium are strong acids, carboxylic acid to water are weak acids, ammonia and below are not acidic.
