Answer / biomaster
The quantitative relationship among PH,buffering action of
amixture of weak acid and its conjugate base and the PKa of
the weak acid is given by a simple expression called
The shape of titration curve of any weak acid is expressed
by Henderson-Hasselbalch equation.This is auseful way of
restating the expression for the dessociation constant of
For the dessociation of aweak acid HA into H+ and A-,this
equation can be derived as follows.
by rearraning the equation for solving H+
by converting to logarthmic functions
log [H+]=LOG Ka+log[HA]/[A-]
making expression negative
SUBSTITUTING ph for -log[H=] and PKa for -logKa
NOW TO REMOVE MINUS SIGN INVERT LAST TERM I.E -LOG[HA]/[A-]
TO OBTAINHENDERSON-HASSELBALCH EQUATION.
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