1. The Determination of Keq for [FeSCN2+]

2. Data Table 1: Find [FeSCN2+]
Find moles of your limiting reagent for each reference solution used: (KSCN):
X moles?
M (KSCN)
[FeSCN2+]

3. Making a calibration Curve:

4. Data Table 2- Test Solutions:
Example for Test Solution #6:
Concentration of Fe3+ ions =
(0.0020M)(5.0mL)=( x M)(10.0mL)
1.0 x 10-3 M
Concentration of SCN- ions =
(0.0020M)(1.0mL)=( x M)(10.0mL)
2.0 x 10-4 M

5. Data Table 3- Results: From Calibration Curve (look at absorbance and
get concentration)
[Fe3+] eq = [Fe3+]initial – [FeSCN2+]eq
[SCN-] eq = [SCN-]initial – [FeSCN 2+]eq
Sample Test
[FeSCN2+]eq
[Fe3+] eq
[SCN-]eq
Keq #6 #7 #8 #9
#10