BIOLOGY 253 Lecture Notes - Lecture 4: Dynamic Equilibrium, Titration, Acid Dissociation Constant
13 Jan 2017
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Buffering, titration curves and introduction to amino acids. Lechatlier"s prin(cid:272)iple- if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change. Increase the concentration of a-drives reaction to the left, an increase in ab, but in the process, using up. B, concentration of b will drop ph buffers. Weak a(cid:272)id/(cid:272)onjugate (cid:271)ase pairs that follow lechatelier"s prin(cid:272)iple in re i ting (cid:272)hanges in the h+ (cid:271)y releasing or absorbing protons. Increased protons in the solution: protons shift to the left; ph is the same. Decreased protons in the solution: pushes reaction left to right, proton concentration changes, but it has been buffered, ph not changed. Lower ph, less dissociation (protonated), high concentration of protons. Amount of dissociation in solution: pka describes how a weak acid/base will behave in a specific ph. (cid:862)(cid:272)hara(cid:272)teristi(cid:272)(cid:863) pka determines how much dissociation occurs in solution. Happens in middle of the curve in a graph.
