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Buffer Capacity Calculator

Formula

To calculate the Buffer Capacity (B):

$B = \frac{n}{pH2 - pH1}$

Where:

$B$ is the Buffer Capacity
$n$ is the Amount of Acid/Base (moles/liter)
$pH2$ is the Final pH
$pH1$ is the Initial pH

What is Buffer Capacity?

A buffer capacity is defined as a solution’s ability to resist a change in acidity or pH. It measures how well a solution can maintain its pH when an acid or base is added.

Example Calculation

Let's assume the following values:

Amount of Acid/Base ( $n$ ) = 0.1 moles/liter
Initial pH ( $pH1$ ) = 4.0
Final pH ( $pH2$ ) = 4.5

Using the formula:

$B = \frac{0.1}{4.5 - 4.0} = \frac{0.1}{0.5} = 0.2 \text{ moles/liter}$

The Buffer Capacity is 0.2 moles/liter.