The major difference between the Arrhenius Theory and the Brønsted Theory is that there is no hydrogen in the Brønsted Theory.

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The major difference is that the Arrhenius Theory defines acids and bases in terms of their ability to produce H+ and OH- ions in water, while the Brønsted Theory defines acids as proton donors and bases as proton acceptors, which inherently involves hydrogen.

The Major Difference Between the Arrhenius Theory and the Brønsted