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If the equilibrium constant Kc for the reaction A + B ⇌ C is 4 at 25°C, what wil

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Question: If the equilibrium constant Kc for the reaction A + B ⇌ C is 4 at 25°C, what will be the value of Kc if the concentration of A is doubled?

Options:

  1. 1
  2. 2
  3. 4
  4. 8

Correct Answer: 4

Solution: 

Doubling the concentration of A will shift the equilibrium to the right, but Kc remains constant at 4.

If the equilibrium constant Kc for the reaction A + B ⇌ C is 4 at 25°C, what wil

Practice Questions

Q1
If the equilibrium constant Kc for the reaction A + B ⇌ C is 4 at 25°C, what will be the value of Kc if the concentration of A is doubled?
  1. 1
  2. 2
  3. 4
  4. 8

Questions & Step-by-Step Solutions

If the equilibrium constant Kc for the reaction A + B ⇌ C is 4 at 25°C, what will be the value of Kc if the concentration of A is doubled?
  • Step 1: Understand what Kc means. Kc is a number that tells us the ratio of the concentration of products to the concentration of reactants at equilibrium.
  • Step 2: Identify the reaction: A + B ⇌ C. Here, A and B are reactants, and C is the product.
  • Step 3: Note the given Kc value, which is 4 at 25°C. This means that at equilibrium, the ratio of the concentration of C to the product of the concentrations of A and B is 4.
  • Step 4: Consider what happens when the concentration of A is doubled. This means we have more A available for the reaction.
  • Step 5: Understand that when the concentration of a reactant (A) is increased, the equilibrium will shift to the right to produce more product (C).
  • Step 6: However, even though the equilibrium shifts, the value of Kc itself does not change. It remains at 4 because Kc is only affected by temperature, not by changes in concentration.
  • Equilibrium Constant (Kc) – The equilibrium constant (Kc) is a ratio of the concentrations of products to reactants at equilibrium, and it remains constant at a given temperature regardless of changes in concentration.
  • Le Chatelier's Principle – This principle states that if a system at equilibrium is disturbed, the system will adjust to counteract the disturbance and restore a new equilibrium.
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