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Equilibrium Changes

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Qualitatively Investigating Changes in Equilibrium Research Topic: In this lab we will be observing the qualitative changes in equilibrium by changing known concentrations of reactants: iron and thiocyanate ions, and finding its effect on the position of equilibrium. We will be using a colorimeter to find the absorbance of the solutions with known concentrations and we will plot a graph of absorbency vs. concentration which will allow us to quantitatively track the changes in equilibrium of a solution. I will be using iron nitrate and potassium thiocyanate in order to give us ironthiocyanate. ...read more.


I will keep this constant by using metal ions (Fe3+) and using that same reactant throughout all of my trials. Colorimeter Different colorimeters may have different absorbency ratings. As well using different cuvettes may change the absorbency readings. I will use the same colorimeter and the same plastic cuvette for all trials. Concentration of Reactants Different concentrations of both reactants would give me an unkown product concentration. Then I will not be able to even make a curve of absorbancy vs concentration if I do not even know the concentration. Use same concentration of both reactants. ...read more.


Since it is clear it should be 0. Part 2 1. Label the test 1,2,3,4 and fill with the following amounts: Test Tube Fe(NO3)3 (ml) KSCN (ml) H2O (ml) 1 5 2 3 2 5 3 2 3 5 4 1 4 5 5 0 5 18 (0.200M) 2 (0.002) 0 2. Prepare the thiocynate solution (Fe(SCN)2+(aq) by mixing 18 ml of 0.200 Fe(NO3)3 with 2 ml of 0.002 KSCN. This will give us the solution whose unknown concentration we want to find. 3. We fill the plastic cuvette with the solution in test tube 1 and find the absorbency. We write it down in the following table. Test Tube 1 2 3 4 5 Absorbance ?? ?? ?? ?? ...read more.

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