Question

Mechanism of buffer action henderson hazel equation

Answer 1

Dear user,

The Henderson–Hasselbalch equation relates the pH of a solution containing a mixture of the two components to the acid dissociation constant, Ka, and the concentrations of the species in solution. To derive the equation a number of simplifying assumptions have to be made.

Answer 2

Answer: The Henderson-Hasselbalch equation is a mathematical expression that relates the pH of a solution to the pKa of an acid and the ratio of the concentrations of its conjugate base and acid forms.

Explaination:

The equation is: pH = pKa + log([A⁻]/[HA])

• where pH is the negative logarithm of the hydrogen ion concentration, pKa is the negative logarithm of the acid dissociation constant (Ka), [A⁻] is the concentration of the conjugate base, and [HA] is the concentration of the acid.

• The Henderson-Hasselbalch equation helps to explain the buffer action of a solution. A buffer is a solution that resists changes in pH when small amounts of acid or base are added.
• Buffers work by having a conjugate acid-base pair present in the solution, where the acid can neutralize added base and the base can neutralize added acid.

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