Identifying Phenol with FeCl3: Color Change with Acid

mirzaei ebi
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in identification of phenol with fecl3 if we add an acid (e.g:HCl) color of complex will disappear >why?
 
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What is a ligand?
 
C6H5OH + FeCl3 <------> C6H5OFeCl2 (charge transfer complex) + HCl
 

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