In Lab Experiment 2, you studied the following equilibrium:Fe3+(aq) + SCN–(aq) ⇌ Fe(SCN)2+(aq)If you knew the equilibrium constant K and the initial concentrations of Fe3+(aq) and SCN–(aq), what would be the simplest way to determine the equilibrium concentration of Fe(SCN)2+(aq)? A. By writing the equilibrium constant equation and solving it for [Fe(SCN)2+]equ. B. By measuring the absorbance of the equilibrium samples and using the Beer–Lambert law. C. By ensuring that SCN– is not in excess relative to Fe3+(aq). D. [Fe(SCN)2+]equ is always equal to the initial concentration of SCN–. E. By plotting the absorbance of Fe(SCN)2+(aq) versus concentration and determining the slope.

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Answered: In Lab Experiment 2, you studied the…

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter12: Chemical Equilibrium

Section: Chapter Questions

Problem 12.22PAE

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In Lab Experiment 2, you studied the following equilibrium:

Fe³⁺(aq) + SCN^–(aq) ⇌ Fe(SCN)²⁺(aq)

If you knew the equilibrium constant K and the initial concentrations of Fe³⁺(aq) and SCN^–(aq), what would be the simplest way to determine the equilibrium concentration of Fe(SCN)²⁺(aq)?

A.
By writing the equilibrium constant equation and solving it for [Fe(SCN)²⁺]_equ.
B.
By measuring the absorbance of the equilibrium samples and using the Beer–Lambert law.
C.
By ensuring that SCN^– is not in excess relative to Fe³⁺(aq).
D.
[Fe(SCN)²⁺]_equ is always equal to the initial concentration of SCN^–.
E.
By plotting the absorbance of Fe(SCN)²⁺(aq) versus concentration and determining the slope.

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