Often seen in chemical equations (along with s, l and g), aq stands for aqueous solution and usually means "something dissolved in water", e.g. sodium hydroxide...
Oxford Collocations DictionaryAqueous is used with these nouns: solution ... Word Originmid 17th cent.: from medieval Latin aqueus, from Latin aqua 'water'. Want...
/ˈeɪkwiəs/ · adjective. similar to or containing or dissolved in water. “aqueous solutions” · adjective. produced by the action of water. synonyms: sedimentary.
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