Explain what happens if a system at equilibrium is subject to one of the following changes and why:Part AThe concentration of a reactant is increased. The concentration of a reactant is increased. When a concentration of a reactant is increased, the denominator of Q increases and the reaction must shift to the right. When a concentration of a reactant is increased, the denominator of Q decreases and the reaction must shift to the right. When a concentration of a reactant is increased, the denominator of Q increases and the reaction must shift to the left. When a concentration of a reactant is decreased, the denominator of Q increases and the reaction must shift to the right.

Direction of Reaction: In order to know the achievement of equilibrium state, we use reaction qoutient (Q).

Explanation:

The ratio of concentrations of products to reactant at any particular time is called reaction quotient. It is obtained by applying law of mass action.

Q=  [Products]/[Reactants]

The value Q leads to one of the following possibilities:

i) Q< Kc: This indicates the more product is needed to acquire equilibrium. Therefore, system must shift to the right untill rquilibrium is attained.

ii) Q>Kc: This indicate less product is needed to acquire equilibrium. Therefore, system must shift to the left.

iii) Q=Kc: Reaction is at equilibrium. No shift occur.

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