7.3 Reaction Quotient & Equilibrium Constant

For aA + bB ⇌ cC + dD: K = [C]^c[D]^d / [A]^a[B]^b. Leave out pure solids and liquids.

Q has the same form but uses current (not equilibrium) values.

Kc uses molarity; Kp uses partial pressures.

Worked example: CaCO₃(s) ⇌ CaO(s) + CO₂(g) → K = [CO₂].