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Chemical Equlilbria Research Paper Work to

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Work to be done:

  • By experiments find out how chemical equilibria works. Chemicals and setup:
  • Two beakers
  • Five test-tubes
  • Kaliumtiocyanat, KSCN
  • 0.002M Kaliumtiocyanatsolution, KSCN + H2O
  • Dinatriumfosfat, Na2HPO4
  • 0.002M Iron ( III ) nitratesolution, FeNO3
  • 0.2M Silvernitratesolution, AgNO3


One test-tubes is filled half of distilled H2O ( A ) and another with kaliumtiocyanatsolution ( B ) . Both solutions are colourless. Solution ( B ) contains SCN- . I add five beads of Fe ( III ) nitratesolution to both test-tubes and the kaliumtiocyanatsolution turns dark-red. The account is that there has been a reaction in solution ( B ) , Fe3+ + SCN- FeSCN2+ , where FeSCN2+ has a dark-red colour.

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Lab 2 The solution in test-tube ( B ) is placed in five other test-tubes. I will now execute four different experiment and so compare with the original solution, and therefor I label the test-tubes a, B, degree Celsius, vitamin D and e.In test-tube ( a ) I add some KSCN ( Adams ) and therefor raise the concentration of SCN- in the solution. The seeable alteration is that the solution bend darker red.

And since FeSCN2+ is ruddy, the decision is that the solution contains more FeSCN2+.

To test-tube (c) I add some FeNO3 and the concentration of Fe3+ is increased and the solution turns darker red a the concentration of FeSCN2+ is higher. Since no more SCN- has been added the ratio Fe3+ and SCN- must be in equilibrium. The solution now contains Fe3+, SCN-, FeSCN2+, NO3- and K+.To test-tube (d) I add five drops of silvernitrate, AgNO3, and the solution is turning brighter – the concentration of FeSCN2+ must decrease. There seems to be a fight about the SCN-ions, both Ag+ and Fe3+ want them, but the Ag+ions seems to win and form a salt, AgSCN, that is hard diluted in water. The effect is, as described earlier, that the concentration of FeSCN- has decreased and the color of the solution is lighter red. The reaction formula is Fe3+ + SCN- a FeSCN2+, the reaction is to the left and the reaction is reversible.In the last test-tube I add some dinatriumhydrofosphate, Na2HPO4, and the solution becomes colorless, there is no more FeSCN2+. The concentration of Fe3+ has decreased. In the reaction Fe3+ + SCN- a FeSCN2+, the reaction is to the left.


In the reactions above I have changed the equilibrium by changing the concentration of different substances.

Cite this Chemical Equlilbria Research Paper Work to

Chemical Equlilbria Research Paper Work to. (2018, May 12). Retrieved from https://graduateway.com/chemical-equlilbria-essay-research-paper-work-to/

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