01:160:162 Lecture Notes - Lecture 18: Buffer Solution, Conjugate Acid, Weak Base
25 Jul 2017
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Buffer solution that resists ph changes. Solution contains components that can react with (and neutralize) added strong acid (h+ / h3o+) or added strong base (oh ) Many physiological processes occur in a very narrow ph range. Buffering keeps ph of reaction environment relatively constant. Both components must be present in significant amounts for the solution to be considered a buffer! Buffers able to maintain constant phs because of common ion effect when weak acid is added to solution that already contains the anion of the acid, the acid will dissociate less and will be less acidic. Compare ph of 1. 0 m hf in water vs. 1. 0 m hf in 1. 0 m naf (aq) Because naf (aq) contains an ion common to hf (f ) hf will not dissociate as much. Remember le chatelier"s principle: presence of f- from naf disrupts acidity of hf. Hf (aq) h+ (aq) + f (aq)
