Arrhenius' Idea

'An Acid is something when dissolved in water will produce H+ ions'

Acids release hydrogen ions in water.

Bases dissociated in water to give hydroxide ions.

Arrhenius focused on the idea that acids and bases split into ions when they dissolved in water. In a sense, the Arrhenius concept focuses on what the chemical contains or what is there in solution.

Important features of acids and bases: They are multiprotism and neutralization.

Acids and bases neutralize one another because the hydrogen ion and the hydroxide ion combine with one another to form water. 

E.g.

Acid = HCl

HCl  H⁺ + Cl^-

Base = NaOH

NaOH Na⁺ + OH^-