Q.Explain how will you predict the direction of a equilibrium reaction.

The direction in which a reaction will move is found by comparing the reaction quotient with the equilibrium constant. …

The question asks how the direction of a reaction (whether it will go forward or backward to reach equilibrium) is predicted.

The reaction quotient, Q, is calculated using exactly the same expression as the equilibrium constant Kc, but using the CURRENT (not necessarily equilibrium) concentrations of the reactants and products at any given instant. For a reaction aA + bB ⇌ cC + dD,

Qc = ([C]^c [D]^d) / ([A]^a [B]^b)

Comparing Q with Kc tells us which way the reaction must shift to reach equilibrium:

• If Q < Kc: the products are too few relative to reactants, so the reaction proceeds in the FORWARD direction (more products form) until Q rises to equal Kc. …