CHM 2046C Sample Module 12 Name: _________________

Part C. Derivation of Henderson-Hasselbalch Equations 10 points

1. Given the ionization of weak acid, HA in water, derive the Henderson-Hasselbalch equation for a weak acid.

Start with writing the ionization reaction of the Weak Acid and setup the equilibrium constant expression for K_a:

2. Given the ionization of base acid, BOH in water, derive the Henderson-Hasselbalch equation for a weak base.

Start with writing the ionization reaction of the weak Base and setup the equilibrium constant expression for K_b: