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- conjugate acid
- The acidIn Arrhenius theory, a substance that produces hydrogen ions (hydronium ions) in aqueous solution. In Bronsted-Lowry theory, a hydrogen-ion (proton) donor. In Lewis theory, a species that accepts a pair of electrons to form a covalent bond. formed when a baseIn Arrhenius theory, a substance that increases the concentration of hydroxide ions in an aqueous solution. In Bronsted-Lowry theory, a hydrogen-ion (proton) acceptor. In Lewis theory, a species that donates a pair of electrons to form a covalent bond. accepts a hydrogen ionAn atom or covalently bonded set of atoms that carries an overall net charge. (protonThe positively charged particle in an atomic nucleus; its mass is similar to the mass of a hydrogen atom.).