Journal Entry:
When colorless solutions containing ions and ions are combined, a deep-red complex ion, quickly forms, as shown in the net ionic equation above. Which of the following explains the observation that adding a few additional crystals of results in the red color of the solution becoming deeper?
A) 
B) 
C) 
D) 
Learning Intentions
We will learn Le Chatelier's principle and how reaction respond to disturbance to equation in equilibrium.
We will learn how various conditions such as temperature, pressure and addition of reactants or products affect a system in equilibrium.
Closing Task:
You can determine the effect of a disturbance on a reaction in equilibrium using Q and Le Chatelier's principle.
Content Standards being covered:
Systems at equilibrium respond to disturbances by partially countering the effect of the disturbance (Le Chatelier's principle). (E.K. 6.B.1)
A disturbance to a system at equilibrium causes Q to differ from K, thereby taking the system out of the original equilibrium state. The system responds by bringing Q back into agreement with K, thereby establishing a new equilibrium state. (E.K. 6.B.2)
When the difference in Gibbs free energy between reactants and products (ΔGº) is much larger that the thermal energy (RT), the equilibrium constant is either vary small (for ΔGº>0) or very large (for ΔGº <0). When ΔGº is comparable to the thermal energy (RT), the equilibrium constant in near 1. (E.K. 6.D.1)