 # How To Calculate Acid Neutralizing Capacity ## Introduction

Acid neutralizing capacity (ANC) is a measure of the capability of water to resist changes in pH when acid is added. The acid neutralizing capacity of water is typically measured in milligrams per liter (mg/L). It is an important parameter to consider when assessing water quality, since changes in the pH of water can help indicate the presence of contaminants and cause other water-quality related issues. In this article, we\’ll take a look at how to calculate the acid neutralizing capacity of water.

## Equipment and Materials Needed

In order to calculate the ANC of water, you\’ll need a few pieces of equipment and materials. These include a pH meter, a burette, a beaker, a graduated cylinder, and acid-base indicators. Additionally, you\’ll need a sample of water and a buffer solution, such as a pH 4 buffer solution.

## Calculation Procedure

The first step in the calculation procedure is to measure the pH of the sample water. This can be done using a pH meter. Once the pH of the water has been measured, the next step is to add a few drops of the buffer solution to the beaker containing the sample water. This will help to ensure that the pH of the sample water stays constant during the ANC calculation.

Once the buffer solution has been added, the next step is to measure the volume of the sample water using a graduated cylinder. This volume should be noted for later use. Next, add a few drops of an acid-base indicator to the sample water and mix it in. This will help to indicate when the sample water has reached its acid neutralizing capacity.

Now, using the burette, begin to add drops of acid to the sample water. As each drop of acid is added, stir the sample water to ensure that the acid is dispersed evenly. Continue to add drops of acid until the acid-base indicator changes color. This indicates that the sample water has reached its acid neutralizing capacity.

## Calculation of ANC

Once the acid neutralizing capacity has been reached, the next step is to calculate the ANC. To do this, simply multiply the volume of the sample water by the amount of acid added. This will give you the ANC of the sample water in milligrams per liter (mg/L).

## Conclusion

As you can see, calculating the ANC of water is a fairly straightforward process. By following the steps outlined above, you can easily calculate the acid neutralizing capacity of any sample of water. This is an important parameter to consider when assessing water quality, as it can help to indicate the presence of contaminants and cause other water-quality related issues.