Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Can you please explain how to calculate the equilbrium concentrations of Fe3+ and NCS-.
Transcribed Image Text:Volume (mL)
Volume (mL)Volume (mL)
Absorbance Readings
Test
5.00×10°M
5.00x10 M
Fe(NO,),
tube
NaNCS
H,0
0.22
1
5.0
1.0
4.0
5.0
0.35
2
2.0
3.0
5.0
0.48
3.0
2.0
5.0
0.66
4
4.0
1.0
5.0
0.93
5.0
0.0
Standard solution of "known concentration"
0.22
3.
Transcribed Image Text:Table 15.2. Eguilibrium concentrations and equilibrium constant.
Molarity of FENCS* in solution of “known concentration" (M) 5.00 x 105
Initial number of moles
Total
Number of moles at equilibrium
Test
volume
(mL)
tube
Fe
NCS
Fe
FENCS
NCS
1
2.5 x 104
5.0 x 10-7
2.495 x 10
10
5.0 x 10"
2
2.5 x 104
1.0 x 10
10
2.495 x 10 5.0 x 107
5.0 x 107
3
2.5 x 104
1.5 x 106
10
2.495 x 104
1.0 x 10
5.0 x 10"
2.5 x 104
2.0 x 106
10
2.495 х 10
1.5x 10*
50х 10
5
2.5 x 104
2.5 x 106
10
2.495 x 10 2.0 x 10*
5.0 x 10"
Equilibrium concentrations (M)
Test tube
Equilibrium constant, K
Fe
NCS
FENCS
5.00 x 105
2
7.95 x 10-5
3
1.09 x 104
1.50 x 104
2.11 x 104
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