2. Ferrous ions can bedetermined by allowing them to stoichiometrically react wi

Question

2. Ferrous ions can bedetermined by allowing them to stoichiometrically react with acolorless

solution of 1,10-phenanthroline (“Phen”) according to the followingreaction.

Fe 2+ +3 Phen –> [Fe(Phen)3] 2+

When reacted, the ironand reagent form a chelate complex, [Fe(Phen)3 ] 2+ , that has a deep red

color. Themax is 510 nm; the molar absorptivityconstant, 0 , of the chelate complex is 23,500.

The spectrophotometerin use has a 1.00 cm path length. If the corrected absorbance is0.753, use

A = 0 bc tocalculate:

i) the molarconcentration of the chelate complex

ii) and indirectly theconcentration of the ferrous ions

Explanation / Answer

i) 0.753 = 23500 (1) C => C =0.753/23500 =3.20E-5   b) according to the reaction above there is 1 moleof iron for every 1 mole of  cheatal complex, so 3.20E-5M Cheatal X 1 mole Fe = 3.20E-5 M Fe                                   1mole cheatal

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