Determination of chloride by Fajans

Principle

In this experiment a sodium chloride solution of unknown concentration but known volume is filled into a vessel and an indicator (here: fluorescein) is added. A silver nitrate solution with a known concentration (standard solution, 0.1 M) is filled into the burette and added dropwise to the solution being analysed until the indicator changes colour. The volume, which can be read off the burette, and the known concentration of the acid are then used to calculate the concentration of the base.

Learning objectives 

• Test for chloride
• Fajan-test

Benefits

• Experiment literature available for pupils and teachers: Minimum preparation time
• Simple teaching and efficient learning by using the available interactive experiment literature