Write an equation that represents the action in water of nitrous acid as an arrhenius acid.

Arrhenius Acid:

Arrhenius Acid is any specie which when dissolved in water produces H⁺ (proton) Ions.

Nitrous Acid:

Nitrous Acid also acts as Arrhenius Acid when dissolved in water.

HNO₂ + H₂O → NO₂⁻ + H₃O⁺

Where,

H₃O⁺ ⇆ H⁺ + H₂O

As HNO₂ produces H⁺ Ions in water, so it is an Arrhenius Acid.