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Which ions form water during neutralisation?

Answer and explanation

Correct answer: Hydrogen ion and hydroxide ion

The essential ionic step in neutralisation is H+ + OH− → H2O. Acids furnish hydrogen ions in aqueous solution, while soluble bases furnish hydroxide ions. These ions combine to form water; spectator ions such as Na+ and Cl− remain in solution and can form sodium chloride. Calcium-carbonate and copper-sulphate pairs do not represent the general water-forming step, so option A is correct.

Related tags

NeutralisationHydrogen IonHydroxide IonAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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