Determination of an Equilibrium Constant

Obtaining the Calibration Curve

Enter the absorbance for each of the following solutions :
  Volume (in mls.)  
Solution # 0.200 M
Fe(NO3)3		 0.002 M
NaSCN		 [FeSCN]
(× 10-3)		 Absorbance
1 49.50 0.50 0.02
2 48.75 1.25 0.05
3 47.50 2.50 0.10
4 46.25 3.75 0.15

Determining the Equilibrium Constant

Enter the absorbance for each of the following solutions :
  Volume (in mls.)  
Solution # 0.200 M
Fe(NO3)3		 0.002 M
NaSCN		 0.5 M
HNO3		 Absorbance
1 5.00 1.00 4.00
2 5.00 2.00 3.00
3 5.00 3.00 2.00
4 5.00 4.00 1.00
5 5.00 5.00 0.00

Click to do calculations for finding the Equilibrium Constant.

Solution # [FeSCN]-2
(× 10-3)		 [Fe]+3
(× 10-3)		 [SCN]-1
(× 10-3)		 Kc
1
2
3
4
5

Average Equilibrium Constant =

Slope and y-intercept for the best straight line going through the experimental points and including the point (0,0) for concentration = 0.0 and absorbance = 0.0
slope =
y-intercept =

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