Question

Can someone explain shifting equilibrium??

Answer 1

I can't, but Khan Academy helped me understand. Here's the link:
http://www.khanacademy.org/science/chemistry/v/le-chatelier-s-principle

Answer 2

Equilibrium is a state where the forward and reverse reaction rates are stable. This can be upset through several factors, all governed by LeChatlier's Principle. Essentially, if you disrupt the inherent balance, the reaction will seek to remove the added stress.

For example, if you add more reactants to a reaction already at equilibrium, the reaction will convert those reactants to products (shifting equilibrium to the right). If you add products, the equilibrium will shift to the left. If you increase the temperature, the reaction will seek to push the reaction to use up the additional heat (to the right if endothermic, to the left if exothermic). The opposite is true when heat is removed.