• A Brønsted-Lowry acid is a substance that can donate a proton (H⁺), and a Brønsted-Lowry base is a substance that can accept a proton
• A Lewis acid is a substance that can accept an electron pair, while a Lewis base is a substance that can donate an electron pair.
• An Arrhenius acid is a substance that increases the concentration of hydrogen ions (H⁺) in aqueous solution, while an Arrhenius base increases the concentration of hydroxide ions (OH⁻).
• Sir Humphry Davy proposed that acids are substances that contain replaceable hydrogen atoms, and their acidic properties are due to the presence of hydrogen.
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