xrtzx said:
can sumone plz elaborate on the change in pressure, change in conc and change in temp
Le Chatelier's Principle: If a chemical reaction system at equilibrium is subjected to a change in conditions, the system will adjust itlsef to re-establish equilibrium in such a way as to counteract the imposed.
Change in pressure.
If you increase the pressure of the equilibrium, then the reaction will go in the direction where there is less pressure.
eg. N2O4 (g) <---> 2NO2 (g)
----- 1 mole--------- 2 mole
If the pressure of this system is increased, then the reaction will go to the left since there is less moles of gas on the left. Increasing the pressure of the whole system leads to a decrease in volume.
Change in conc.
Increasing the concentration NO2 by adding more NO2 will result in the reaction moving towards the left so there is a decrease in the amount of NO2. If there is a removal of NO2, the reaction will go to the right to make more NO2.
Change in temp.
eg. N2 (g) + 3H2 (g) <---> 2NH3 (g) (exothermic reaction)
Heat is released when the reaction goes from left to right. If you increase the temp., the reaction will go in the direction to counteract this increase in heat, therefore, from right to left. If the temp. is decreased, then the reaction will go from left to right to cause an increase in heat.