Redox indicators in titrations in aqueous nitric acid.
Iron(II) in nitric acid solution can be titrated with dichromate (and vice versa), diphenylamine, N-phenylanthranilic acid, ferroin, or brucine being used as indicator. Fluoride is added when one of the first three is used, and urea if the last is used. Citric, oxalic and tartaric acids, arsenic(III) and mercury(I) interfere in the titration.
Sandhu
S S
SS
Chemistry Department Panjab University Chandigarh, India; Chemistry Department, Government College, ChandigarhIndia.
Dhillon
S C
SC
Singh
D
D