A reaction reaches equilibrium

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Presentation transcript:

A reaction reaches equilibrium

Solids and liquids never appear in equilibrium expressions P4 (s) + 6Cl2 (g) ⇌ 4PCl3 (l) Keq = [Cl2]6 By convention, the constant concentrations of pure solids and liquids are understood to be incorporated into the equilibrium constant itself and left out of the equilibrium constant expression.

P4 (s) + 6Cl2 (g) ⇌ 4PCl3 (l)

The composition of equilibrium mixture is independent of amount of solid present, as long as some is always present.

Q < K Reaction shifts right to form more products. Reaction Quotient Increasing Q (reactants only) Q = ∞ Keq Q = 0 (products only) Q < K Reaction shifts right to form more products. Q = K System is at equilibrium. Q > K Reaction shits left to form more reactants.