The equilibrium constant at the new temperature is 7 x 10^-6.
To calculate the equilibrium constant at the new temperature, we can use the equation for equilibrium:
[Fe(SCN)2+][Fe³+][SCN-] / [Fe³+][SCN-] = K
Since the initial concentration of [Fe(SCN)2+] is 0 M and the equilibrium concentration is 0.0014 M, we can substitute the values into the equation:
0.0014 M x (0.005 M)(0.004 M) / (0.004 M) = K
Simplifying, we get:
K = 0.0014 M x 0.005 M = 7 x 10^-6