If an acidic solution is diluted ten times with water, which change is expected?
Answer and explanation
Correct answer: pH will increase but the solution may still remain acidic
The governing concept is the effect of dilution on hydrogen-ion concentration. Diluting an acidic solution tenfold reduces [H⁺] to one-tenth. Since pH = −log[H⁺], the pH rises by about one unit for an ideal strong-acid solution, but it generally remains below 7 unless the dilution is sufficient or other effects are considered. Thus acidity decreases without automatically becoming basic. Option B is correct; A, C, and D contradict this relationship.
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What is the correct answer to this question?
pH will increase but the solution may still remain acidic
Why is this the correct answer?
The governing concept is the effect of dilution on hydrogen-ion concentration. Diluting an acidic solution tenfold reduces [H⁺] to one-tenth. Since pH = −log[H⁺], the pH rises by about one unit for an ideal strong-acid solution, but it generally remains below 7 unless the dilution is sufficient or other effects are considered. Thus acidity decreases without automatically becoming basic. Option B is correct; A, C, and D contradict this relationship.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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