Question: In a dilute nitric acid solution, Fe3+ reacts with thiocyanate ion (SCN-) to form a dark-red complex: The equilibrium concentration of [Fe(H2O)5NCS]2+ may be

In a dilute nitric acid solution, Fe3+ reacts with thiocyanate ion (SCN-) to form a dark-red complex:

The equilibrium concentration of [Fe(H2O)5NCS]2+ may be determined by how darkly colored the solution is (measured by a spectrometer). In one such experiment, 1.0 mL of 0.20 M Fe(NO3)3 was mixed with 1.0 mL of 1.0 × 10-3 M KSCN and 8.0 mL of dilute HNO3. The color of the solution quantitatively indicated that the [Fe(H2O)5NCS]2+ concentration was 7.3 × 10-5 M. Calculate the formation constant for [Fe(H2O)5NCS]2+.

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