Question

In a reversible reaction. is it true that two substances are in equilibrium if the concentration of each increases by the same amount but the equilibrium constant remains unaffected?

Answer 1

Yes, it is true that the equilibrium constant remains unaffected when you change any of the concentrations.

Explanation:

The equilibrium constant is a constant at a given temperature.

Consider the equilibrium

`"A ⇌ 2B"`

`K_"eq" = "[B]"^2/"[A]"`

If you change any of the concentrations, `K_"eq"` does not change.

Instead, the system adjusts itself so that the new values of of `"[A]"` and `"[B]"` create a new position of equilibrium that satisfies the value of the `K_"eq"` expression.