Arrhenius acid is "a compound that increases the H⁺ ion concentration in aqueous solution".
What is a compound?
Compounds are "pure substances that are composed of atoms of two or more different elements".
What is ion?
Ion is "an atom or molecule that has gained or lost one or more of its valence electrons, giving it a net positive or negative".
What is aqueous solution?
Aqueous solution is "a chemical solution in which the solvent is water".
Hence, the example of Arrhenius acid is HI.
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