Balance the following reaction of iron (II) with 1, 10-phenanthroline and provid

Question

Balance the following reaction of iron (II) with 1, 10-phenanthroline and provide the K_eq expression. _____ Fe^2+(aq) + _____ C_12H_8N_2(aq) rightarrow _____ Fe(C_12H_8N_2)_3^2+(aq) Why in the crystal violet experiment did you set the colorimeter to 565 nm and in the iron thiocyanate experiment use 470nm? Make sure there is an explanation as to the different wavelengths with regard to color. Find the absorbance and transmittance of a 0.073 M solution of a substance with a molar absorptivity of .335M^-1 cm^-1 in a cell with a 1.50 cm path length.

Explanation / Answer

1) FeCl2+C12H8N2-------------->Fe(C12H8N2)3Cl2

2) the wavelength of absorbed radiation depends on the followig factors

1.concentration of the solution

2.path lenght

3. Nature of the complex (energy differance between splitting d orbitals)

And colour depends on emmited radiation .

3) Absorbance=molar absorptivity×concentration ofcsolution ×path length

=0.335×0.073×1.5

= 0.0366825

Transmitance (T)=I/I°

(Or)

2.303log(I/I°)=€×C×l

=0.0335×0.073×1.1=0.366825

log(I/l°)=0.01592

I/l° =antilog(0.01592)

=1.03735.

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