Question

7. Addition of HCl to solution 4. When HCl is added to the solution, the Fe3+ and Cl- ions form the stable complex FeCl4-, thus affecting the equilibrium. (a) Should the [Fe3+] in the cuvet initially increase or decrease when the HCl is added? (b) As the [Fe3+] changes as predicted in part (a), what effect should this have on the [FeSCN2+]? (Refer to the reaction given in question 4(d) and consider Le Châtelier's principle.) (c) As the [FeSCN2+] changes as predicted in part (b), what effect should this have on the absorbance? (d) Did your experimental absorbance change as predicted in part (c)? If not, resolve the discrepancy.

          7. Addition of HCl to solution 4. When HCl is added to the solution, the Fe3+ and Cl- ions form the stable complex FeCl4-, thus affecting the equilibrium.
(a) Should the [Fe3+] in the cuvet initially increase or decrease when the HCl is added?
(b) As the [Fe3+] changes as predicted in part (a), what effect should this have on the [FeSCN2+]? (Refer to the reaction given in question 4(d) and consider Le Châtelier's principle.)
(c) As the [FeSCN2+] changes as predicted in part (b), what effect should this have on the absorbance?
(d) Did your experimental absorbance change as predicted in part (c)? If not, resolve the discrepancy.

7. Addition of HCl to solution 4. When HCl is added to the solution, the Fe3+ and Cl- ions form the stable complex FeCl4-, thus affecting the equilibrium.
(a) Should the [Fe3+] in the cuvet initially increase or decrease when the HCl is added?
(b) As the [Fe3+] changes as predicted in part (a), what effect should this have on the [FeSCN2+]? (Refer to the reaction given in question 4(d) and consider Le Châtelier's principle.)
(c) As the [FeSCN2+] changes as predicted in part (b), what effect should this have on the absorbance?
(d) Did your experimental absorbance change as predicted in part (c)? If not, resolve the discrepancy.

Added by Zeze D.

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