Which of the following correctly explains why an acid shows acidic behaviour only in aqueous solution?
Hydrogen ions (H+) are produced only when the acid dissolves in water.
Acidic character is defined by the release of hydrogen ions (H+), which in water exist as hydronium ions (H3O+).
A pure acid such as HCl gas or glacial ethanoic acid contains covalent molecules; without water there is no medium to solvate and separate the ions, so the acid does not ionise and shows no acidic behaviour (dry HCl gas does not turn blue litmus red).
When the acid is dissolved in water, water molecules pull the H+ away from the acid molecule and stabilise it as H3O+, which is what produces the sour taste, litmus change and reaction with metals or bases.
Hence, hydrogen ions are produced only when the acid dissolves in water.
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