Calculate the e l value by using Beer's Law, Eq. (4), the absorbance value, and the given [FeSCN2+]. [2 points]
Abs = El c
El = (0.232/1.00e-4)
Record your data into the table below and use the e I value to calculate [FeSCN2+] for each test tube. [2 points]
Test Tube #
Absorbance Value
[FeSCN2+]
Standard
0.232
1.00 x 10-4 M
1.
0.093
4.00 e -5
2.
0.206
8.90 e -5
3.
0.171
7.40 e -5
4.
0.310
5.
0.384
Él value
2320
Results
Calculate the initial concentrations for each reactant that was used in test tube #1. (Hint: MâVâ=M2V2) [2 points]
((5.00ml) (4.00e-5))/10 ml = (10ml)x / 10.0ml
Complete the 'RICE' table to find the concentrations of each species at equilibrium in test tube #1. [2 points]
Reaction
Fe3+
Initial
2e-5
Change
-X
Equilibrium
+
SCN-
4e-6
-X
Calculate the equilibrium constant, Kc, for test tube #1. [2 points]
2
FeSCN2+
0
+X
4.00 e -5
Complete the table below for all the test tubes and calculate the average equilibrium constant. [2 points]
Molar Concentrations at Equilibrium
Test Tube
#
1.
2.
3.
4.
5.
[Fe3+]
[SCN-]
[FeSCN2+]
[2 points] Average Kc Value:
Kc
