How to Prepare Ferric Ammonium Sulphate Indicator
Introduction
Ferric ammonium sulphate (FAS) indicator is a common chemical indicator used to detect the presence of reducing agents, such as sodium thiosulphate. It is prepared by reacting ferric chloride with ammonium sulphate in the presence of water. The resulting solution is a deep red color, which turns colorless when it comes into contact with a reducing agent.
Materials
* Ferric chloride solution (FeCl3)
* Ammonium sulphate solution ((NH4)2SO4)
* Water
* Volumetric flask
* Pipette
* Graduated cylinder
Safety Precautions
* Wear gloves and eye protection when handling chemicals.
* Always add acid to water, not vice versa.
* Do not ingest or inhale chemicals.
* Dispose of chemicals properly according to local regulations.
Instructions
1. Measure 10 mL of ferric chloride solution into a 100 mL volumetric flask.
2. Add 10 mL of ammonium sulphate solution to the flask.
3. Fill the flask to the mark with water.
4. Mix the solution thoroughly.
Troubleshooting
* If the solution is not a deep red color, check the concentration of the ferric chloride and ammonium sulphate solutions.
* If the solution turns colorless in the absence of a reducing agent, the solution may be contaminated. Prepare a fresh solution.
Uses
FAS indicator is used in a variety of chemical reactions, including:
* Titrations to determine the concentration of reducing agents
* Redox reactions
* Detection of antioxidants
Conclusion
Ferric ammonium sulphate indicator is a simple and inexpensive indicator to prepare. It is a useful tool for detecting the presence of reducing agents in chemical reactions.
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