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### La Chatelier's Principle

Posted: Sat Jan 25, 2020 10:41 pm
When the concentration of reactant or product is increased, the reaction will proceed in which direction?

### Re: La Chatelier's Principle

Posted: Sat Jan 25, 2020 10:45 pm
If the concentration of a reactant is increased, the reaction should typically proceed to the right (towards products). If the concentration of the products is increased, then typically the reaction will proceed in the reverse direction, towards the left (towards reactants).

### Re: La Chatelier's Principle

Posted: Sat Jan 25, 2020 11:38 pm
If the concentration of molecules on one side of a reaction increases, then the reaction will proceed in the direction that would produce the molecules on the other side of the reaction in order to consume the excess and so as to reach equilibrium again. Thus if the concentration of reactants increases, then the forward reaction would be favored because more product would be produced until the ratio of products to reactants equals the equilibrium constant. If the concentration of products increases, then the reverse reaction will be favored because the concentration of reactants will increase until the ratios are at equilibrium.

### Re: La Chatelier's Principle

Posted: Sun Jan 26, 2020 12:28 am
So the whole concept of Le Chatelier's principle is that you are trying to minimize the effect of some sort of strain you have put on the system. To answer what you're saying, if the concentration of the reactants goes up, then that means you are adding more reactants to the system at equilibrium, so the system is going to use up more of the reactants to get back to equilibrium, so the reaction will shift to the right (towards the product). This makes sense mathematically, the equilibrium constant for the reaction must stay the same, and it equals to the concentration of products over the concentration of the reactants, so if the concentration of the reactants goes up, then the concentration of the products must go up as well. The same concept for increasing the concentration of products at the beginning, just the opposite of everything I have already said.

### Re: La Chatelier's Principle

Posted: Sun Jan 26, 2020 1:05 am
It will proceed in the other direction. For example, if products are added, the reaction will proceed toward the reactants, whereas if more reactants are added, the reaction will proceed toward the products.

### Re: La Chatelier's Principle

Posted: Sun Jan 26, 2020 1:13 am
if the concentration of reactants increase then the reaction will move towards the products, and if the concentration of products increase then the reaction will move towards the products.

### Re: La Chatelier's Principle

Posted: Sun Jan 26, 2020 6:08 pm
If you can, draw a quick scale. If you add products, the scale will tip right and in order to regain equilibrium, the system will move to the left and vice versa.

### Re: La Chatelier's Principle

Posted: Sun Jan 26, 2020 6:10 pm
the reaction will move away from the side of the concentration increase

### Re: La Chatelier's Principle

Posted: Sun Jan 26, 2020 8:21 pm
Increasing the concentration of the reactant will decrease Q, meaning that the reaction will shift towards the products in order to increase Q so that it can become = to K and vice versa