Le Chitelier’s Principle

Le Chitelier s principle states that if an equilibrium system is stressed, the equilibrium will shift in the direction that relieves the stress. For the Haber process at equilibrium, if more nitrogen is added, then the process will shift to the right. If nitrogen is removed, then the equilibrium will shift to the left. 

What does Le Chitelier s principle state about the effect of an addition of NH3 on a mixture of N2 and H2 before it attains equilibrium ... 

LE CHATELIER S PRINCIPLE We discuss Le Chitelier s principle, which predicts how a system at equilibrium responds to changes in concentration, volume, pressure, and temperature. 

But think about the size of x. With no added I , we found x = 0.001 2s M. Now we anticipate that x will be smaller than 0.(X)1 2s M, because of Le Ch telier s principle. Addition of I" to Reaction 6-8 displaces the reaction in the reverse direction. In the presence of extra I", there will be less Pb. This application of Le Chitelier s principle is called the common ion effect. A salt is less soluble if one of its constituent ions is already present in the solution. 

Le Chitelier s prmciple simply summaries the observed behavior of equilibrium sterns therefore, it b incorrect to say that a given equilS>rium shift occurs "because of Le Chitelier s principle. 

Of course, energy is not a chemicai product of this reaction, but thinking of it in this way makes it easy to apply Le Chitelier s principle. 

Check Apply Le Chitelier s principle to see that the reaction proceeds in the direction that lowers the increased concentration or raises the decreased concentration. 

Media Player/MPEG Animation Figures 15.10 and 15.11, Le Chitelier s Principle, pp. 656-659. 

Note that the cell voltage decreases slightly because of the nonstandard concentrations. This change is consistent with the predictions of Le Chitelier s principle (see Sample Exercise 17.5). In this case, since the reactant concentration is lower than 1.0 M and the product concentration is higher than 1.0 M, eeii is less than... 

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