Multiple Choice
What is the pH of a buffer system that has 0.25 M HCN and 0.38 M CN⁻, given that the pKa of hydrocyanic acid is 9.23?
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18. Aqueous Equilibrium
Henderson-Hasselbalch Equation
Multiple Choice
Which is the correct form of the Henderson-Hasselbalch equation?
A
pH = pKa + log([A-]/[HA])
B
pH = pKa - log([HA]/[A-])
C
pH = pKa - log([A-]/[HA])
D
pH = pKa + log([HA]/[A-])
Verified step by step guidance1
The Henderson-Hasselbalch equation is used to estimate the pH of a buffer solution, which consists of a weak acid and its conjugate base.
The general form of the Henderson-Hasselbalch equation is:
In this equation, is the negative logarithm of the acid dissociation constant, , of the weak acid.
represents the concentration of the conjugate base, and represents the concentration of the weak acid.
The correct form of the equation is:
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