Question

Write the equilibrium constant for the following equation: H2O(l) ⇔ H+(aq) + OH- (aq)

Answer 1

Answer:

Kw = [H⁺] . [OH⁻]

Explanation:

Equilibrium constant for water autoionization equation is called Kw

By the way, the correct form is this:

2H₂O → H₃O⁺ + OH⁻

We do not consider water as a reactant so the correct formula for the constant is:

Kw = [H⁺] . [OH⁻]

Remember that [H⁺] and [OH⁻] must be molar concentrations.

Kw = 1ₓ10⁻¹⁴ → Therefore [H⁺] = [OH⁻] = 1ₓ10⁻⁷ M

Answer 2

The equilibrium constant for the given equation is Kw = [H⁺] . [OH⁻]

What is Equilibrium constant?

This is used to show the relationship between products and reactants of a reaction at equilibrium with respect to a specific unit.

2H₂O → H₃O⁺ + OH⁻

Sibnce water isn't considered as a reactant, we have:Kw = [H⁺] . [OH⁻]

[H⁺] and [OH⁻] in molar concentrations.

Kw = 1×10⁻¹⁴ then  [H⁺] = [OH⁻]

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