The fromula which is used to represent a solution is designated as 'aq' which means aqueous solution.
What is solution?
Solution is a mixture which is prepared by dissolving solute particles in the solvent material.
Solution is always present in the liquid state and sometime people will confuse in between the symbols like (l) and (aq). But (l) represents the pure liquid for and aq means aqueous solution which is used to represent a solution.
Hence 'aq' is used to represent solution.
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