lab is completed, the goal is to complete the lab_form using the lab image submitted.

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Answered Same DayApr 16, 2024

Answer To: lab is completed, the goal is to complete the lab_form using the lab image submitted.

P answered on Apr 17 2024
20 Votes
Name                                    
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Results
1. Qualitative examination of equilibria and Le Chatelier's Principle (20 pts)
(You may scan and incorporate a pdf of your group’s data sheet.)
    Well #
    Contents (drops)
    Observations
    
1
    
F
e(NO3)3 [3]
    No color change, clear liquid
    
2
    
KSCN [3]
    No color change, clear liquid
    
3
    
Fe(NO3)3 [1]/KSCN [1]
    Solution turned orange
    
4
    
Fe(NO3)3 [2]/KSCN [2]
    Light orange solution
    
5
    
Fe(NO3)3 [3]/KSCN [3]
    Orange solution
    
    For 6-13 all wells start with: Fe(NO3)3 [3]/KSCN [3]
    
    
6
    
Distilled water [2] (control)
    No change in solution, stayed orange
    
7
    
Fe(NO3)3 [2]
    No change, solution stayed orange
    
8
    
KSCN [2]
    No change
    
9
    
KSCN [4]
    No change
    
10
    
KSCN [1, 1M]
    Solution changed from orange to reddish orange/red
    
11
    
Na2HPO4 [2]
    Orange to clear solution
    
12
    
H2SO4 [2]
    Orange to clear solution
    
13
    
KSCN [1, 1M]/H2SO4 [3]
    Orange to reddish-orange solution
    
    For 14-18 materials are: 0.0025M Fe(NO3)3/
0.1M HNO3/1M KSCN
    
    
14
    
As above 1/4/4
    Orange solution
    
15
    
As above 2/3/4
    Dark orange solution
    
16
    
As above 3/2/4
    Reddish-orange solution
    
17
    
As above 4/1/4
    Dark-red orange solution
    
18
    
As above 5/0/4
    Red solution (dark)

1.
2. Beer's Law Plot for the Absorbance of Fe(SCN)2+ (20 pts)
(You may scan and incorporate a pdf of your group’s data sheet or include a pdf of your group’s Excel page.)
    Test Tube #
    
[Fe3+]initial=[Fe(SCN)2+]eq
    
A475
    
1
    
    0097
    
2
    
    0.149
    
3
    
    0.173
    
4
    
    0.248
    
5
    
    0.307
    
6
    
    0.460
    
7
    
    0.556
    Slope of line (A475 vs. [Fe(SCN)2+]) = ε =
    1
The slope represents the molar absorptivity coefficient.
Let's choose two points, say (0.097, A1) and (0.556, A7):
ε = (ΔA475) / (Δ[Fe(SCN)₂⁺])

ΔA475 = A7 - A1
Δ[Fe(SCN)₂⁺] = [Fe(SCN)₂⁺]₇ - [Fe(SCN)₂⁺]₁
Substitute the values:
ΔA475 = 0.556 - 0.097
= 0.459
Δ[Fe(SCN)₂⁺] = [Fe(SCN)₂⁺]₇ - [Fe(SCN)₂⁺]₁
= 0.556 - 0.097
= 0.459
Now, calculate the slope:
ε = ΔA475 / Δ[Fe(SCN)₂⁺]
= 0.459 / 0.459
= 1
So, the slope of the line (ε) for the Beer's Law plot is 1.
1. Absorbance measurements to determine the Equilibrium Constant (20 pts)
    Test Tube #
    
[Fe(SCN)2+]eq...
SOLUTION.PDF

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