Question

Acetic acid has a pk*of 2 x 10-s m at 25"c approximatety. approximately what fraction of a 0 .l m solution of acetic acid wilt be dissociated

Answer 1

[A-] is the concentration of anions or salt i.e. dissociated form. [HA] is the concentration of the acid.

According to Henderson- Hasselbalch equation,


This means log( [A-]/[HA]) = 2

so, [A-]/[HA] = 10^2 = 100

[A-] = 100 * [HA]

The dissociated form is 100 times more than the associated form.

Therefore, percentage dissociated=

([A-]/([A-]+[HA]))*100%

= (100[HA]/(100[HA]+[HA]))*100%

=(100/101) *100%

=99.009%

Answer 2

Explanation:

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