Identifying Phenol with FeCl3: Color Change with Acid

In summary, FeCl3 is commonly used in the identification of phenol due to its ability to form a colored complex with the compound. It can also be used to identify other compounds such as carboxylic acids, alcohols, and amines, but the color change observed may vary. The presence of phenol is indicated by a purple or violet color change when FeCl3 is added. However, there are limitations to this method as other compounds with similar functional groups may also give a positive reaction. The concentration of FeCl3 used can vary, with a commonly used concentration being 1%, but this may affect the intensity of the color change.
  • #1
mirzaei ebi
1
0
in identification of phenol with fecl3 if we add an acid (e.g:HCl) color of complex will disappear >why?
 
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  • #3
What is a ligand?
 
  • #4
C6H5OH + FeCl3 <------> C6H5OFeCl2 (charge transfer complex) + HCl
 

1. What is the purpose of using FeCl3 in identifying phenol?

FeCl3 is commonly used in the identification of phenol because it forms a colored complex with phenol, allowing for easy visual detection of its presence.

2. Can FeCl3 be used to identify other compounds besides phenol?

Yes, FeCl3 can also be used to identify other compounds such as carboxylic acids, alcohols, and amines. However, the color change observed may vary depending on the compound.

3. What color change indicates the presence of phenol with FeCl3?

The presence of phenol is indicated by a purple or violet color change when FeCl3 is added. This is due to the formation of a complex between FeCl3 and the hydroxyl group on phenol.

4. Are there any limitations to using FeCl3 in identifying phenol?

Yes, there are some limitations to this method. Other compounds with similar functional groups, such as cresols and anilines, may also give a positive reaction with FeCl3, leading to potential false positives.

5. Is there a specific concentration of FeCl3 that should be used for this identification process?

The concentration of FeCl3 used can vary depending on the sensitivity and specificity desired. A commonly used concentration is a 1% solution, but it is important to note that the intensity of the color change may also be affected by the concentration of the compound being tested.

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