Solved: In a dilute nitric acid solution, Fe31 reacts with
Chapter 23, Problem 23.46cb(choose chapter or problem)
In a dilute nitric acid solution, Fe31 reacts with thiocyanate ion (SCN2) to form a dark-red complex: [Fe(H2O)6] 31 1 SCN2 H2O 1 [Fe(H2O)5NCS]21 The equilibrium concentration of [Fe(H2O)5NCS]21 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 3 1023 M KSCN and 8.0 mL of dilute HNO3. The color of the solution quantitatively indicated that the [Fe(H2O)5NCS]21 concentration was 7.3 3 1025 M. Calculate the formation constant for [Fe(H2O)5NCS]21.
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