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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: AhmedEzatAlzawalaty on March 19, 2007, 01:13:52 PM

Title: Ferric and Salicyclic acid
Post by: AhmedEzatAlzawalaty on March 19, 2007, 01:13:52 PM

What is the cause of violet color in the reaction of ferric with salycilic acid?

Title: Re: Ferric and Salicyclic acid
Post by: ARGOS++ on March 20, 2007, 06:35:05 PM

Dear ahmedezat,
It’s quite easy, Phenols like free Salycilic Acid forms a simple 1:1 Complex
with Fe³⁺ (Of course, including some water?), which in your case is blue,
and detectable at ~540nm, if you do it in aqua.
It can be “hold” linear (Beer-Lambert!) over a wide concentration range!
There is a standard method written!

Good Luck!
                   ARGOS++

Title: Re: Ferric and Salicyclic acid
Post by: AhmedEzatAlzawalaty on March 21, 2007, 08:33:45 AM

thank u ARGOS++