What is the equilibrium constant expression for the autoionization of water?

Understand the Problem

The question is asking for the correct expression of the equilibrium constant for the autoionization of water, which involves understanding the concentrations of the species involved in this reaction.

Answer

Kw = [H₃O⁺][OH⁻].

The equilibrium constant expression for the autoionization of water is Kw = [H₃O⁺][OH⁻].

Answer for screen readers

The equilibrium constant expression for the autoionization of water is Kw = [H₃O⁺][OH⁻].

More Information

In the autoionization of water, water molecules react with each other to form hydronium ions (H₃O⁺) and hydroxide ions (OH⁻) in equilibrium. Kw, the ion-product constant, is temperature-dependent and commonly valued at 1.0 x 10⁻¹⁴ at 25°C.

Tips

Avoid confusing hydronium (H₃O⁺) and hydroxide (OH⁻) ions with their neutral form (H₂O). Forgetting to consider temperature variations that affect Kw is also a pitfall.

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