Acids in solutions produce hydrogen ions (H⁺). When an acid dissolves in water, it donates hydrogen ions to the solution. These hydrogen ions are responsible for the acidic properties of the solution, such as its sour taste and ability to turn blue litmus paper red. For example, hydrochloric acid (HCl) dissociates in water to form hydrogen ions (H⁺) and chloride ions (Cl⁻). The presence of hydrogen ions is what makes a solution acidic.
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