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Determination of Equilibrium Constant

  1. Mar 16, 2008 #1
    I did an experiment in my Chem II class that required finding the equilibrium constant for this reaction

    Fe3+ + SCN- ->Fe(SCN)2+

    For the experiment, I had to use a calibration curve and Beer's law. How do I know that the calibration curve obeys Beer's law? I know that it would have to be a linear line, but are there other requirements?

    To create this curve, I made solutions with Fe(NO3)3, KSCN, and HNO3. What would happen to the K value if I used water instead? Is it the acidity or the polarity that affects the equilibrium constant? How would I be able to increase or decrease a K value? Change the concentrations?
  2. jcsd
  3. Mar 16, 2008 #2


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    For first part: straight-line, intersects the origin.

    For second part: read your textbooks to properly study this, but if pH is decreased, formation constant will decrease; if increase the pH, then formation constant will increase.
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