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In a chemical equation, the subscript (aq) after a molecule means that it is aqueous. An aqueous solution is a solution in which the solvent is water.

Example: CN-(aq), H2CO3(aq)
It represents that the ionic state is only in the water (solute); Latin 'aqua' is water
It stands for "aqueous", and means it's dissolved in water.

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Q: What does the abbreviation aq mean after a compound in an equation?
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