Question

1)      a) Estimate the formula of Fe(III)-SSA complex (iron and SSA concentrations are equal to each other).

    Here is a crude example of  the general shape of the graph:

b)      A solution is prepared by mixing 0.0121 M, 6.67 mL M and 0.0121 M, 13. 33 mL L and diluting to 100 mL.  ϵ of the complex ML₂ is 865 and the maximum absorbance is 0.612. Calculate K_f of the complex.

 

 

 

 

 

 

 

c)       The molar absorptivity for the complex formed between iron (III) and sulfosalicylic acid is  9.32x10 ³ L/mol.cm at 500 nm. Calculate the range of permissible concentrations for the complex if greater absorbance is to be neither less than 0.10 nor greater than 0.90 when the measurements are made in 1.00 cm cells.

Answer 1

both answered

sum the a) Bayu two of are Job's plot, the of the motar. concentrations binding partners is held constant, but their mole fractions fraction of Fe (ui) is varied. mol observed ou in this curre x & fe(n) -0.4:006 SSA absordbonce za :3 0.4 2 SSA . ki wavelength, mot fraction of iron (11) fi- *Fe (11)} Formula of complex feq (SSA); [HL 2 [H] [L]² Foros dilute solutions, constant light path (6) and at a fixed absorbance is di directly propontiana to the concentration (c) of the absorbing species in moles per litre A = Ebc E is proportionality constant (the molar absorptivity Lambart- Beer's law, A = 6.6 [ML] ; b=lem initial moles of moles of Metal (M)= 0.0121 mofur XOO0667 8:07x105 mol MAX VL =0.0121 H.X 0.01333 it 1.612 x 10-4 mol equilibrium, [M] - 8.07x1605 mol where, by M Х vy Н initial и h Ligond (L) = = 8:07X10 8.07X104 M 100 mL -3 1.612x10-4 mol o. 1 mL 1.612x10 M -4 7.075X10 M [2]= A - EDCHL] [ML] 0.612 865 bretx Icm En (HL) [H][L]2 -4 ky 7.075X16 IM 8.07x104 M*(1.612 X10-3M) 2 3.37x105 H4 kg of complex is 3.37x105