I need to find the concentrationo of FeSCN 2+ . Here is all of my data! Can you

Question

I need to find the concentrationo of FeSCN2+. Here is all of my data! Can you point me in the right direction on how to find [FeSCN2+]?

Part A1: Standard Solutions 2.00x10-1 M Fe(NO3)3 4.00x10-4 M NaSCN 0.10 M HNO3 Vtotal     (mL) [Fe3+] [SCN-] Vtotal (mL) Vi (mL) Vf (mL) Vtot (mL) Vi (mL) Vf (mL) Vtot (mL) S1 2.00 0.99 8.94 7.95 9.95 .040 M S2 2.00 0.33 1.31 0.98 0.35 7.21 6.86 9.84 .041 M 3.98x10-5 S3 2.00 1.31 3.32 2.01 1.22 7.22 6.00 10.01 .040 M 8.03x10-5 S4 2.00 0.50 3.50 3.00 0.92 6.10 5.18 10.18 .039 M 1.18x10-4 S5 2.00 0.14 4.12 3.98 0.12 4.21 4.09 10.07 .040 M 1.58x10-4 S6 2.00 0.00 5.00 5.00 0.19 3.10 2.91 9.91 .040 M 2.02x10-4 Part A2: Analyzing Standard Solutions % Transmittance Absorbance S1 100 0 S2 80.8 0.093 S3 71.6 0.145 S4 40.7 0.390 S5 38.8 0.411 S6 32.4 0.489

Explanation / Answer

In the above reaction, every mole of Fe reacts with 1 moles of SCN

So,

lets see 1 reading.

M of Fe3+ = 0.41 M

M of SCN- = 3.98 x 10^-5 M

Since the concentration of SCN- is lower this will be the limiting reagent for the reaction. SCN- available would react with Fe3+ and once this is over the reaction stops.

So,

So the concentration of complex FeSCN2+ will be 3.98 x 10^-5 M

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