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If a base is slowly added to an acidic solution, what generally happens to its pH?

Answer and explanation

Correct answer: pH will increase

An acidic solution has a pH below 7 because it contains a relatively high concentration of hydrogen ions. A base reacts with and neutralises some of this acidity. As base is added gradually, the hydrogen-ion concentration generally falls, so the pH rises toward 7. It may rise above 7 if excess base is added. Therefore, option A is correct; option B gives the opposite trend, while C and D are scientifically incorrect.

Related tags

ScienceClass10Acids-BasesNeutralisationPhAcidsBasesAnd SaltsAcids Bases And SaltsChemical Substances – Nature And Behaviour

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