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A solution is diluted slowly, but its pH does not move far from 7 because it was already neutral. Which solution could it be?

Answer and explanation

Correct answer: Aqueous sodium chloride solution

The governing concept is the nature of salts formed from strong acids and strong bases. Sodium chloride is produced from hydrochloric acid and sodium hydroxide, so its aqueous solution is generally neutral, with pH close to 7. Dilution lowers the concentrations of both sodium and chloride ions but does not create a significant excess of hydrogen or hydroxide ions. Hydrochloric acid and sodium hydroxide would remain acidic or basic, while sodium carbonate is basic.

Related tags

Neutral SaltSodium ChloridePhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And BehaviourChemical Substances Nature And BehaviourScience

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