# How do you calculate PKa using the Henderson-Hasselbalch equation?

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PH=6.98. Mix 25ml of 0.1M #NaH_2PO_4# and 25ml of 0.1M #Na_2HPO_4# and dilute with water in a 250ml Volumetric flask.

PH=6.98. Mix 25ml of 0.1M

##### 1 Answer

May 16, 2016

#### Explanation:

The Henderson-Hasselbalch equation is:

Therefore,

Note that the new concentrations are divided by

Notice that n this case the

Here is a video that explains more this topic (topic starts at minute 9:02):

**Acid - Base Equilibria | Buffer Solution.**