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 –nx and products will have +nx (products/forward reaction favored)
○ Q > K → reactants will have +nx and products will have –nx (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