Think of Le Chatelier’s Principle as an equation teeter totter. At equilibrium, the teeter totter is level. If add or remove something, how is the teeter totter going to move and what needs to be done to make it level again?
If something is added to one side of the equation, the teeter totter will tilt towards the opposite side to try and balance the equation. For example, if more reactants are added to a reaction, the teeter totter will tilt towards the products side to try and balance the equation. To make the teeter totter level again, the system needs to shift in the opposite direction of the change. So, if more reactants were added, the system needs to shift towards the products to balance the equation again. This is achieved by increasing the rate of the forward reaction or decreasing the rate of the reverse reaction.
