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LE CHATELIER'S PRINCIPLE
The objective of the experiment is to demonstrate how experimental conditions affect chemical equilibrium. The effect of the reactant concentration (CH3COO-) and the common ion addition (H+) on the reaction, which is given bellow, is studied.
3 Fe3+ + 6 CH3COO- + 2 H2O 
[Fe3(OH)2(CH3COO)6]+ + 2 H+
A solution of the complex [Fe3(OH)2(CH3COO)6]+ is an intense orange. A SpektraTM spectrometer can be used to evaluate the yield of the reaction: the higher is the concentration of the coloured complex; the higher is the absorbance of the examined solution.
On the basis of the activities presented here, Le Chatelier's principle can be introduced.
Hazards
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Hydrochloric acid is corrosive, irritating to the eyes, the respiratory system and the skin. In the event of contact with the eyes, rinse immediately with plenty of water and seek medical advice.
R 36/37/38, S 26
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Prepared
by: Nataša
Gros, University of Ljubljana,
Faculty of Chemistry and Chemical
Technology
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