Le Chatelier's Principle

Discussion:

At Q 1 A reaction is at equilibrium when the ratio of the product and the reactant side are equal. This could further be seen by the reaction quotient depicted by Qc is equal to the equilibrium constant, Kc, of the given chemical reaction. Given that aA + bB ↔ cC +dD, the small letters being the mole coefficients and the big letters being the molecules of the chemical equation, K_eq=([〖C]〗^c [〖D]〗^d)/([〖A]〗^a [〖B]〗^b ) is the formula for finding the Kc of any given reversible equation. The symbol used in writing an equation that involves equilibrium is a double-headed arrow to indicate that indeed, the reaction could go forward and backward.

At Q 2 Le Chatelier’s Principle states that a solution at equilibrium will shift accordingly so that any stress applied to the solution will lessen so that the solution will be at equilibrium once again. Le Chatelier’s Principle is observed in part I wherein the different concentrations affect the equilibrium of the CoCl2 in water or ethanol. From the results above, the 12 M HCl and H2O caused enough stress on the solution to shift the equilibrium. The lower concentrations however, was not able to cause a significant stress in the solution which resulted to the solution having no change in color.

Part II is also similar with part I in terms that it partially deals with the concentration as the main factor in shifting the equilibrium. The difference is that whatever was added to stress the reaction would also be neutralized in the end since part II deals with the same molarity if HCl and NaOH. Another difference is that two of the three pocedures involved the use of Ba(NO3)2. Whenever Ba(NO3)2 was added, the solution would become cloudy or murky because of the precipitate that...

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...ure as the controlled flask.

Works Cited

Silberbeg, M. Principles of General Chemistry: Third Edition. 2013. McGraw-Hill (Chapter 4: Three Major Classes of Chemical Reactions) (Chapter 17: Equilibrium: The Extent of Chemical Reactions)

Yeh, S. (2013, February 7). Le Chatelier's Principle - Sara's AP Chemistry. Sara's AP Chemistry. Retrieved November 20, 2013, from http://sarasapchemlabs.weebly.com/le-chateliers-principle.html

Co(H2O)6 2+/ CoCl4 2- Equilibrium Demonstration Sheet. (n.d.). Co(H2O)6 2+/ CoCl4 2- Equilibrium Demonstration Sheet. Retrieved November 20, 2013, from http://chemed.chem.purdue.edu/demos/demosheets/12.10.html

Gross, R., Abenojar, E. C., & Tan, J. A. (2010) Modern experiments in general chemistry II (3rd ed.). Ateneo de Manila University.