Can ferric(3) oxide or ferric(3) acetate be substituted with ferric(3) chloride for phenol test ?

Can ferric(3) oxide or ferric(3) acetate be substituted with ferric(3) chloride for phenol test ?

1 Answer
Dec 17, 2017

Answer:

I don't think ferric oxide and ferric acetate can be substituted with #FeCl_3#, as they are insoluble in water.

Explanation:

The reaction between phenol and ferric chloride is
#6C_6H_5OH + FeCl_3 -> H_3[Fe(OC_6H_5)_6] + 3HCl#.
http://intranet.tdmu.edu.ua/data/kafedra/internal/pharma_2/classes_stud/en/pharm/prov_pharm/ptn/pharmaceutical%20chemistry/3%20course/11%20Pharm.analysis%20of%20phenols,%20arom.carboxylic%20acids%20and%20salts.htm

Then, why do I think ferric oxide and ferric acetate is inappropriate?

・Ferric oxide(#Fe_2O_3#) is insoluble in water.
・Ferric acetate(#[Fe_3O(OAc)_6(H_2O)_3]OAc#, where #Ac=CH_3COO^-#) is a coordination compound itself. It is also insoluble in water.
https://en.wikipedia.org/wiki/Iron(III)_acetate