You studied the following equilibrium to determine the value of Kc for the system:
Fe3+ (aq) + SCN- (aq) ⇌ [FeSCN]2+ (aq)
The absorbance of a solution initially containing 5.26 x 10^-4 M [SCN-] and 1.98 × 10^-3 M [Fe3+] was measured. Using a standard curve and the absorbance value, the equilibrium concentration of FeSCN2+ was determined to be 1.23 x 10^-4 M.
What is the value of the equilibrium constant?
Choices:
a) 118
b) 3.63 x 10^3
c) 4.90 × 10^-2
d) 1.64 × 10^-5
e) 164