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For the reaction Fe3+ + OH- ⇌ Fe(OH)3, K = [Fe3+][OH-]^3 / [Fe(OH)3]. If [OH-] is decreased by 1/4 times, what happens to the equilibrium constant?

1. Equilibrium constant remains the same.
2. Equilibrium constant increases.
3. Equilibrium constant decreases.
4. [Fe3+] increases by a factor of 4.

Correct answer: Equilibrium constant remains the same.

Solution

The equilibrium constant (K) is a constant at a given temperature and does not depend on the concentrations of reactants or products. It only changes with temperature.

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