# When is the Henderson-Hasselbalch Equation used?

##### 1 Answer

The Henderson-Hasselbalch equation is used when you are doing buffer calculations.

#### Explanation:

An **acid buffer** is a solution of a weak acid and its salt.

The equilibrium reaction is

The Henderson-Hasselbalch equation is

There are four variables in this equation:

You can calculate any one of them if you know the values of the other three.

Similarly, a **basic buffer** is a solution of a weak base and its salt.

The equilibrium reaction is

The Henderson-Hasselbalch equation is

There are four variables in this equation:

You can calculate any one of them if you know the values of the other three.

You can calculate