According to Arrhenius, an acid is a substance that dissociates in water to produce hydrogen ions (H+). This definition focuses on the ability of acids to increase the concentration of H+ ions in a solution, leading to a decrease in pH. Arrhenius's definition of acids is based on their behavior in aqueous solutions and their ability to donate protons. **

The Arrhenius definition of H2O is that it is a substance that dissociates in water to produce H+ and OH- ions. According to this definition, H2O is considered an acid when it donates a proton (H+) and a base when it accepts a proton. This definition is one of the fundamental concepts in understanding acid-base chemistry and is used to classify substances as acids or bases based on their behavior in water. **

The main difference between Arrhenius and Brønsted is their definitions of acids and bases. Arrhenius defined acids as substances that release hydrogen ions (H+) in water, and bases as substances that release hydroxide ions (OH-) in water. On the other hand, Brønsted defined acids as substances that donate protons (H+) and bases as substances that accept protons. Another difference is that Arrhenius' definition is limited to aqueous solutions, while Brønsted's definition can be applied to non-aqueous systems as well. **

Brønsted bases are a broader category of bases compared to Arrhenius bases. While Arrhenius bases are defined as substances that release hydroxide ions (OH-) in water, Brønsted bases are defined as substances that accept protons (H+ ions). This means that all Arrhenius bases are Brønsted bases, but not all Brønsted bases are Arrhenius bases. Brønsted bases can react with substances other than water to accept protons, making them a more inclusive category of bases. **

The main difference between Brønsted and Arrhenius in chemistry is their definition of acids and bases. Arrhenius defined acids as substances that release hydrogen ions (H+) in water, and bases as substances that release hydroxide ions (OH-) in water. On the other hand, Brønsted-Lowry defined acids as proton (H+) donors and bases as proton acceptors, without the requirement of water as a solvent. Additionally, Brønsted-Lowry theory is more inclusive as it can describe acid-base reactions in non-aqueous solutions, while Arrhenius theory is limited to aqueous solutions. **

Brønsted bases are considered bases in the sense of Arrhenius. Both Brønsted and Arrhenius definitions of bases involve the ability to accept protons (H+ ions). According to the Arrhenius definition, a base is a substance that produces hydroxide ions (OH-) in aqueous solution. In the Brønsted-Lowry definition, a base is a substance that can accept a proton. Therefore, Brønsted bases are also considered bases in the sense of Arrhenius. **

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According to the Arrhenius theory, acids are substances that ionize in water to produce hydrogen ions (H+), while bases are substances that ionize in water to produce hydroxide ions (OH-). On the other hand, the Brønsted-Lowry theory defines acids as proton donors and bases as proton acceptors. In both theories, the key difference lies in the definition of bases, with Arrhenius focusing on the production of hydroxide ions and Brønsted focusing on the acceptance of protons. **