**Type 1: Given initial concentrations and one equilibrium concentration **

- Write balanced, dissolution equation → Set up ICE Table below

○ I: initial concentrations

○ C: Change in concentration

○ E: Equilibrium concentrations

- Solve for x
- If question doesn’t state molarity of substance, assume that it is 0

**Type 2: Given initial concentrations and K**

- Find Q using initial concentrations and compare to K

○ Q < K → reactants will have –*n*x and products will have +*n*x (products/forward reaction favored)

○ Q > K → reactants will have +*n*x and products will have –*n*x (reactants/reverse reaction favored)

- On AP exam can ignore x
- Shortcut using calculator

○ Y1 = value of K

○ Y2 = plug in entire equilibrium equation

○ Graph → 2nd Trace → #5 → don’t move cursor → enter x3

○ X-value will be the answer for x

○ Plug in value for x