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Which symbol represents the state of a substance dissolved in water in a chemical equation?

Answer and explanation

Correct answer: (aq)

Direct answer: A, (aq), is correct. When a substance dissolves in water, it is present in an aqueous solution. The abbreviation aq is written in parentheses after the formula to show this state. For example, NaCl(aq) means sodium chloride dissolved in water. Option B, (s), means the substance is solid, such as NaCl(s) for solid sodium chloride. Option C, (g), means gas, such as H₂(g). Option D, (l), means that the substance itself is a liquid, such as water written H₂O(l); it does not specifically indicate that another substance is dissolved in water. The symbols identify physical state and should not be confused with coefficients, which show relative amounts in a balanced equation. A useful memory cue is “aq sounds like aqua, associated with water.” The distinction between (l) and (aq) is important: a liquid substance and a substance dissolved in water are not described by the same state symbol. Therefore, only A precisely answers the question.

Related tags

Chemical EquationsAqueous SolutionState SymbolsWaterChemical ReactionsClass 10 ScienceChemical Reactions And EquationsChemical Substances – Nature And Behaviour

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