Can you please explain how to calculate the equilbrium concentrations of Fe3+ and NCS-. Volume (mL)Volume (mL)Volume (mL)Absorbance ReadingsTest5.00×10°M5.00x10 MFe(NO,),tubeNaNCSH,00.2215.01.04.05.00.3522.03.05.00.483.02.05.00.6644.01.05.00.935.00.0Standard solution of "known concentration"0.223. Table 15.2. Eguilibrium concentrations and equilibrium constant.Molarity of FENCS* in solution of “known concentration" (M) 5.00 x 105Initial number of molesTotalNumber of moles at equilibriumTestvolume(mL)tubeFeNCSFeFENCSNCS12.5 x 1045.0 x 10-72.495 x 10105.0 x 10"22.5 x 1041.0 x 10102.495 x 10 5.0 x 1075.0 x 10732.5 x 1041.5 x 106102.495 x 1041.0 x 105.0 x 10"2.5 x 1042.0 x 106102.495 х 101.5x 10*50х 1052.5 x 1042.5 x 106102.495 x 10 2.0 x 10*5.0 x 10"Equilibrium concentrations (M)Test tubeEquilibrium constant, KFeNCSFENCS5.00 x 10527.95 x 10-531.09 x 1041.50 x 1042.11 x 104

The volume of solution is given = 10 mL = 0.010 L (since…

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Can you please explain how to calculate the equilbrium concentrations of Fe3+ and NCS-.

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter10: Effect Of Electrolytes On Chemical Equilibria

Section: Chapter Questions

Problem 10.16QAP

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Question

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Can you please explain how to calculate the equilbrium concentrations of Fe3+ and NCS-.

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.

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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