CHM152L Exp D-Equilibrium
Please reset form before entering name and section.
Then, enter data.
Name:
Section:
Enter Data for solutions in Table D-1
First, indicate the size of the volumetric flask used to make up your solutions.
Most will use 25.00 mL volumetric flask. You can change the value for 50.00 mL.
Size of volumetric flask ==>
mL
Second indicate the molarity of the NaSCN stock solution.
Molarity of NaSCN stock solution ==>
M Solution
Enter Data for solutions in Table D-1
Solution Number
mL of stock NaSCN
Solution pipeted
Molarity of NaSCN
Solution after dilution
Absorbance
1
2
3
4
Slope of Line
y intercept
Corr Coefficient
Calculation of Concentration of Unknown Solution
Enter the size of the volumentric flask used to make up the unknown solution.
Size of volumetric flask ==>
mL
Your unknown solution was prepared with
mL of unknown.
Absorbance of SCN
-
solution ==>
Molarity directly off graph ==>
Molarity of NaSCN in the unknown ==>
status ==>
Determiniation of Kc -- from Table 2 Data
Use the Abs. from
Solution 2
to find the equilibrium and change in concentration for FeSCN
2+
.
Lines in yellow
Absorbance for Solution 2 ==>
Equilibrium Calculations
Solution 2
[Fe
3+
]
[SCN
-
]
[FeSCN
2+
]
Initial
Change
Equilibrium
Kc
Use the Abs. from
Solution 3
to find the equilibrium and change in concentration for FeSCN
2+
.
Lines in yellow
Absorbance for Solution 3 ==>
Equilibrium Calculations
Solution 3
[Fe
3+
]
[SCN
-
]
[FeSCN
2+
]
Initial
Change
Equilibrium
K
c
Average K
c