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Hydrogen ions in an aqueous solution must always be represented as

Question
Hydrogen ions in an aqueous solution must always be represented as
H+ alone
H3O+(aq) or H+(aq)
H2 gas
OH- ions
Answer
H3O+(aq) or H+(aq)
Detailed Explanation
Since hydrogen ions cannot exist alone, they combine with water molecules to form hydronium ions, H3O+(aq).
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