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...
Related questions
Question
Is Part B: Determination of K is correct result?

Transcribed Image Text:Data Report Sheet: Spectrophotometric Determination of an Equilibrium
Constant.
Part A: Determination of a Calibration Curve:
Stnd.1
Std. 2
Stnd. 3
Stnd 4
Stnd. 5
Stnd. 6
(CH)
0.000204
0.000127
0.000189
|Fe(SCN)"|
Column A
060000'0
0.
0.432
0.480
0.633
0.831
0.887
Absorbance
Column E
y3 4339.8x+ 0.0258
Equation of Calibration Line:
Correlation Coefficient:
4339.8
Slope (be):
Part B: Determination of K
Expt. 1
Expt. 2
Expt. 3
Expt. 4
Expt. 5
|Fe"al
(Table 1).
0.00165
0.00165
0.00165
0.00165
0.00165
0.00066
0.00132
0.00165
66000'0
(Table 1)
[Fe(SCN)"I
0.0001135 0.000172
0.0002223
Columa F
0.001587
0.0015365 0.001478
0.0014277 0.0013904
0.000267
0.0005465 0.000818
0.0010977 0 0013904
(SCN1
148.6799
135.1678
142.2659 141.8466
134.2843
Average K: 140 448
6.
Expert Solution

Step 1
In order to check the answers, we have to plot ICE chart for the equilibrium reaction below:
Fe3+(aq) + SCN-(aq) <-----> Fe(SCN)2+(aq) ; K = ??
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