# Henderson-Hasselbalch equation

## English[edit]

### Etymology[edit]

Named after Lawrence Joseph Henderson, who devised a related equation in 1908, and Karl Albert Hasselbalch, who re-expressed it in logarithmic terms.

### Noun[edit]

**Henderson-Hasselbalch equation** (*plural* **Henderson-Hasselbalch equations**)

- (chemistry) An equation describing the derivation of pH as a measure of acidity (using pKa, the negative log of the acid dissociation constant) in biological and chemical systems.