Table 2: Volumes for Unknown Equilibrium Solutions Solution Volume in mL of 0.00200 M Fe(NO3)3 Volume in mL of 0.00200 M NaSCN Volume in mL of 0.10 M HNO 3 E1 (blank) 5.00 0.00 5.00 E2 5.00 1.00 4.00 E3 5.00 2.00 3.00 E4 5.00 3.00 2.00 E5 5.00 4.00 1.00 E6 5.00 5.00 0.00 Table 1: Standard Solutions for FeSCN²+ Beer's Law Plot Solution [Fe3+] [SCN] S1 (blank) 4.0 x 10-2 M 0.0 M S2 4.0 x 10-2 M 4.0 x 10-5 M S3 4.0 x 10-2 M 8.0 x 10-5 M S4 4.0 x 10-2 M 12.0 x 10-5 M S5 4.0 x 10-2 M 16.0 x 10-5 M S6 4.0 x 10-2 M 20.0 x 10-5 M
The Equilibrium Constant of a Coordination Complex
S 1: 0 (absorbances) - 447.30 (wavelength)
S 2: 0.078 (absorbances) - 447.30 (wavelength)
S 3: 0.235 (absorbances) - 447.30 (wavelength)
S 4: 0.660 (absorbances) - 447.30 (wavelength)
S 5: 0.823 (absorbances) - 447.30 (wavelength)
S 6: 1.005 (absorbances) - 447.30 (wavelength)
a)Create an absorbance vs. concentration plot of your known standard solutions. Apply a linear fit to obtain the linear regression equation.
b) Use the linear regression equation from your plot of known solutions to determine the unknown equilibrium concentration of FeSCN2+ for each of your mixtures.
c) Use the given amounts and concentrations from Table 2 in the procedure to calculate the initial concentrations of Fe3+ and SCN- in each of your unknowns.
![Table 1: Standard Solutions for FeSCN²+ Beer's Law Plot
Solution
[Fe3+]
[SCN]
S1 (blank)
4.0 x 10-2 M
0.0 M
S2
4.0 x 10-2 M
4.0 x 10-5 M
S3
4.0 x 10-2 M
8.0 x 10-5 M
S4
4.0 x 10-2 M
12.0 x 10-5 M
S5
4.0 x 10-2 M
16.0 x 10-5 M
S6
4.0 x 10-2 M
20.0 x 10-5 M](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F3cff6d5e-6d7b-4ef6-9838-a544f8e2903b%2F7d79485c-1d61-426e-8ca4-af7bf6e5c047%2Fx8t9t3_processed.png&w=3840&q=75)
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