If the pH of a solution increases from 3 to 6, what happens to its acidity?
Answer and explanation
Correct answer: Acidity decreases one thousand times
The governing concept is the logarithmic nature of pH: pH = −log10[H+]. An increase of one pH unit means a tenfold decrease in hydrogen-ion concentration. The change from pH 3 to pH 6 is three units, so [H+] becomes 10 × 10 × 10 = 1000 times smaller. Thus acidity decreases by a factor of 1000, making option A correct; it is not merely three times lower.
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What is the correct answer to this question?
Acidity decreases one thousand times
Why is this the correct answer?
The governing concept is the logarithmic nature of pH: pH = −log10[H+]. An increase of one pH unit means a tenfold decrease in hydrogen-ion concentration. The change from pH 3 to pH 6 is three units, so [H+] becomes 10 × 10 × 10 = 1000 times smaller. Thus acidity decreases by a factor of 1000, making option A correct; it is not merely three times lower.
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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