Arrhenius Theory:
The Arrhenius theory states that acids are substances that dissociate in water and yield H+ ions. 

Brønsted Lowry Theory: 
The Brønsted Lowry theory states that all acids are H+ proton donors and all bases are H+ proton receivers. ​

Lewis Theory:
The Lewis theory states that all acids are electron pair acceptors and bases are electron pair donors

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