bnmichael
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Does the result of the calculation in question 3 justify your original assumption that all of the SCN^- is in the form of FeNCS^2+

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MissPhiladelphia
Fe 3+ + SCN- --> FeSCN 2+ 

.......Fe 3+ .......SCN-.........FeSCN 2+ 
I.......0.04..........0.001.............. 
C........-x...............-x............. 
E.....0.04-x.....0.001-x...........x 

Keq = 203.4 = x / (0.04-x)(0.001-x) 
203.4 = x / (x^2 - 0.041x + 4x10^-5) 
203.4x^2 - 8.34x + 0.00094 = x 
203.4x^2 - 9.34x + 0.00094 = 0 
x = -0.0001M or 0.0458M 
so, using your Keq, there would be no SCN- or Fe 3+ left.....all would be in the form of FeSCN 2+

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