What happens to the value of the equilibrium constant (Kc) for a reaction if the reaction is reverse

JAMB Chemistry 2023 202 views
Source: JAMB · 2023

What happens to the value of the equilibrium constant (Kc) for a reaction if the reaction is reversed?

  1. It remains the same.
  2. It becomes zero.
  3. It becomes the reciprocal of the original value. ✓
  4. It becomes negative
Explanation

Reversing a reaction flips the Kc value. If Kc = 5, the reverse reaction has Kc = 1 ÷ 5 = 0.2.

Kc never becomes zero or negative. It must be a positive number. The value changes when you reverse the equation.

Remember: Forward Kc × Reverse Kc = 1. They are reciprocals of each other.

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