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Which symbol is used to indicate the aqueous state in a chemical equation?

Answer and explanation

Correct answer: (aq)

Direct answer: D, (aq), is correct. In a chemical equation, (aq) is the state symbol for aqueous. It tells us that the substance is dissolved in water, not merely that it is a liquid. For example, NaCl(aq) represents sodium chloride dissolved in water. Option A, (s), means solid; a substance such as calcium carbonate may be written CaCO₃(s). Option B, (l), means that the substance itself is in the liquid state, such as H₂O(l), and does not specifically mean a solute dissolved in water. Option C, (g), means gas, such as CO₂(g). State symbols give physical-state information and are placed after the formula in parentheses. A common confusion is between (l) and (aq): both may involve a fluid system, but (l) identifies a liquid substance, while (aq) identifies a substance present in water as a solution. Memory cue: “aq = aqua = water.” This helps connect the abbreviation with an aqueous solution.

Related tags

Chemical EquationsAqueous SolutionState SymbolsChemical ReactionsClass 10 SciencePhysical StatesChemical Reactions And EquationsChemical Substances – Nature And Behaviour

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