# Why does Le Chatelier's principle work?

Apr 3, 2018

Le Chatelier's principle works to relive stress on a system. The principle works to make a system more stable.

#### Explanation:

The laws of thermodynamics state that everything moves from order to disorder. Stack a bunch of blocks it creates an unstable system that will move to a more stable system by falling down.

If there is a greater concentrations of products than reactants this is a more order system than a balanced concentration of products and reactants. The system will move spontaneously to relieve the stress and move to a less order state. ( this is the second law of thermodynamics, the law of entropy disorder always increases)

Le Chatelier's principle works because a system will always move to relieve stress and move to a more disordered system.

Apr 3, 2018

See Below

#### Explanation:

The other answer is correct - Le Chatlier's principle works because the system is trying to relieve a stress. Let's look at the equilibrium constant, though.

$a A + b B = c C + \mathrm{dD}$

${K}_{e} q = \frac{{\left[C\right]}^{c} {\left[D\right]}^{d}}{{\left[A\right]}^{a} \left[{B}^{b}\right]}$
This is a constant. The K value will be a constant...which is why its called an equilibrium constant (assuming you don't mess with temperature).

So if I add a stress...like adding more of C....the the system is going to try to relieve that stress. But, if i have more C, ${\left[C\right]}^{c}$ is too big, and the K value gets all messed up. So, D goes down and A goes up and B goes up, and with all these things going down and up, my larger value for C ${\left[C\right]}^{c}$ is compensated for by a lower D and higher A and higher B....and K stays the same.