Question

4. When perturbing the equilibrium with heating and cooling, how many times do you think the equilibrium can be shifted before it stops working? Why? How about modification of the equilibrium through changes in concentration?

Answer 1

SOLUTION :

In the following problem we see that the Le-Chatelier's Principle is the guiding principle.The equillibrium once attained can be changed only through changes in Temperature and Concentration.If a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium moves to counteract the change.

Now If the equillibrium is perturbed with heating,

To cool down, it needs to absorb the extra heat that you have just put in. In the case we are looking at, the back reaction absorbs heat. The position of equilibrium therefore moves to the left.

Now If the equillibrium is perturbed with cooling,

The reaction will tend to heat itself up again to return to the original temperature. It can do that by favouring the exothermic reaction.

Change in Concentration

If the concentration of Reactant is increased that means that the position of equilibrium will move so that the concentration of product decreases again - by reacting and turning it intoproducts.The position of equilibrium moves to the right.

If we decrease the concentration of A the opposite will happen the reaction will move towards left and try to increase the concentration of A again