If a basic solution has pH 13, in which direction will it change when water is added?
Answer and explanation
Correct answer: pH will decrease towards 7
The governing concept is dilution. A basic solution has pH above 7 because its hydroxide-ion concentration exceeds its hydrogen-ion concentration. Adding water lowers the concentration of hydroxide ions, so the solution becomes less basic and its pH moves downward toward 7. It does not instantly become acidic; therefore, option B is correct.
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What is the correct answer to this question?
pH will decrease towards 7
Why is this the correct answer?
The governing concept is dilution. A basic solution has pH above 7 because its hydroxide-ion concentration exceeds its hydrogen-ion concentration. Adding water lowers the concentration of hydroxide ions, so the solution becomes less basic and its pH moves downward toward 7. It does not instantly become acidic; therefore, option B is correct.
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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