Table 2: Data Table for Reaction. FeSCN AcMC (C4500) 2 Absorbance 0.103 2 Equili
ID: 1034399 • Letter: T
Question
Table 2: Data Table for Reaction. FeSCN AcMC (C4500) 2 Absorbance 0.103 2 Equilibrium Molarity of FeSCN 2.29e-5 4.8e-5 7.87e-5 9.02e-5 1.214 1.00e-3 1.00e-3 1.00-3 1.00e-3 1.00e-3 4Initial Molarity of SCN 2.00e-4 4.00e-4 6.00e-4 8.00e-4 1.000-3 5Equilibrium molarity Fe9.77e-4 9.52e-4 9.21e-4 9.10e-4 8.79e-4 6Equilibrium Molarity of SCN 1.98e-3 3.52e-4 5.21e-4 7.10e-4 8.79e-4 114.5 143.24 164.01139.61 156.61 Kc Average Ke 143.59 Table 3: Data Table for Reaction: Fe an +2 SCNo)Fe(SCN 0.103 0.216 0.354 0.406 0,546 Absorbance 2 Equilibrium Molarity of Fe(SCN)2 3Initial Molarity of Fe 4Initial Molarity of SCN Equilibrium molarity Fe 6 Equilibrium Molarity of SCN Kc Average KcExplanation / Answer
The relation between absorbance and molarity is given as
A = MC where C is a constant and is equal to 4500 M-1 and M denotes the molarity of the solution.
We shall assume that the initial concentrations of Fe3+ and SCN- are the same as in table 1.
1
2
3
4
5
1
Absorbance
0.103
0.216
0.354
0.406
0.546
2
Equilibrium Molarity of [Fe(SCN)2+] = A/C = Absorbance/4500
2.29*10-5
4.80*10-5
7.87*10-5
9.02*10-5
1.21*10-4
3
Initial Molarity of Fe3+
1.00*10-3
1.00*10-3
1.00*10-3
1.00*10-3
1.00*10-3
4
Initial Molarity of SCN-
2.00*10-4
4.00*10-4
6.00*10-4
8.00*10-4
1.00*10-3
5
Equilibrium Molarity of Fe3+ = (initial molarity of Fe3+) – (equilibrium molarity of [Fe(SCN)2+])
9.77*10-4
9.52*10-4
9.21*10-4
9.10*10-4
8.79*10-4
6
Equilibrium molarity of SCN- = (initial molarity of SCN-) – (equilibrium molarity of [Fe(SCN)2+])
1.77*10-4
3.52*10-4
5.21*10-4
7.10*10-4
8.79*10-4
7
Kc = [Fe(SCN)2+]/[Fe3+][SCN-]2
7.48*105
4.07*105
3.15*105
1.97*105
1.78*105
8
Average Kc
3.69*105
1
2
3
4
5
1
Absorbance
0.103
0.216
0.354
0.406
0.546
2
Equilibrium Molarity of [Fe(SCN)2+] = A/C = Absorbance/4500
2.29*10-5
4.80*10-5
7.87*10-5
9.02*10-5
1.21*10-4
3
Initial Molarity of Fe3+
1.00*10-3
1.00*10-3
1.00*10-3
1.00*10-3
1.00*10-3
4
Initial Molarity of SCN-
2.00*10-4
4.00*10-4
6.00*10-4
8.00*10-4
1.00*10-3
5
Equilibrium Molarity of Fe3+ = (initial molarity of Fe3+) – (equilibrium molarity of [Fe(SCN)2+])
9.77*10-4
9.52*10-4
9.21*10-4
9.10*10-4
8.79*10-4
6
Equilibrium molarity of SCN- = (initial molarity of SCN-) – (equilibrium molarity of [Fe(SCN)2+])
1.77*10-4
3.52*10-4
5.21*10-4
7.10*10-4
8.79*10-4
7
Kc = [Fe(SCN)2+]/[Fe3+][SCN-]2
7.48*105
4.07*105
3.15*105
1.97*105
1.78*105
8
Average Kc
3.69*105
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.