Preparing Ferric Alum Indicator for Chemistry Experiments

Ferric alum indicator is used to detect the presence of alkalinity or acidity in any solution. Here prepare is ferric alum indicator step by step.

Apparatus for Prepare Alum Indicator:

Glass beaker

Glass Rod

Glass Stopper


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Ferric ammonium sulfate Crystals

Distilled Water 

Diluted Nitric acid 

Procedure for Preparation of Alum Indicator

1. Take out weight 140 gm of ferric ammonium sulfate crystals into the clean, dry glass beaker or flask.

2. Add 400 ml of distilled hot water to the glass beaker or flask and stir with a glass rod until the ferric ammonium sulfate crystals are completely mixed or dissolved.

3. When cool and filter the solution through filter paper to remove any impurities, and make up to a volume of 500 ml with diluted (6N) nitric acid.

4. Transfer the ferric alum indicator clear solution to a clean, dry glass bottle with a tight-fitting lid.

5. Label the bottle on the ferric alum indicator and store it in a cool, dark place and this solution indicator is ready to use.

Preparing Ferric Alum Indicator for Chemistry Experiments

Ferric Alum Indicator Uses to

First, add a few drops of ferric Alum Indicator to the solution being tested.

Titrate the tested solution, and observed the color change of the tested solution.

If the tested solution turns yellow, it indicates the presence of acidity.

If the tested solution turns violet or blue, it indicates alkalinity.

Note: Ferric alum indicator solution is commonly used in analytical chemistry to test for the presence of sulfate ions, as it changes color in the presence of these ions. It turns from a yellow color to a reddish-brown color.

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