The ratio of the concentration of a(n) over describes the proportions of a weak acid necessary to satisfy the henderson-hasselbalch equation.

The ratio of the concentration of a conjugate base over weak acid  describes the proportions of a weak acid necessary to satisfy the Henderson-Hasselbalch equation.

Explanation:

The Henderson Hesselbach equation is given as:

pH = potential of H

=Dissociation constant

[Salt] = Concentration of salt

[Acid] = Concentration of acid

Or it can also be represented as:

WeaK acid + Conjugate base

[conjugate base] = Concentration of conjugate base formed from the dissociation of weak acid.

[weak acid] = Concentration of weak acid.

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