Learn the procedure for making a 1, 10-phenanthroline ferrous complex indicator.
The compound that changes color when exposed to acidic or basic solutions is called an indicator. Color indicators are commonly used to measure pH and are added to the reaction mixture to identify the titration endpoint/equivalence point.
Ferroin sulfate (C36H24FeN62+) can be prepared by adding phenanthroline to ferrous sulfate in water. Ferroin is a redox indicator, which is a complexation of phenanthroline and iron. The Fe (II) - phenanthroline complex is red in its reduced state and Fe (III) - phenanthroline complex is blue in its oxidized state. In titrimetric analysis, ferroin serves as an indicator of oxidation-reduction reactions.
How to prepare ferroin indicator for titration:
- Weigh accurately 01.49 gm of 1, 10-phenanthroline, and 0.70 gm of ferrous sulphate, pour it into a 100.00 ml volumetric flask containing 50.00 ml of water, and swirl until it completely dissolved.
- Once it is dissolved, dilute to 100.00 ml with distilled water.
- The concentration of the prepared solution is about 17 g/L.
For visualizing oscillatory Belousov–Zhabotinsky reactions, it is a popular indicator in redox titration. When the oxidation potential of the solution is increased from 1.04 to 1.08 volts, ferrous 1,10-phenanthroline, an oxidation-reduction indicator, changes from red to pale blue.
References:
- Wikipedia contributors. (2021, December 11). Ferroin. In Wikipedia, The Free Encyclopedia. Available Here:
- Law.resource.org. 2022. [online] Available Here:
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