Between solutions with pH 2 and pH 5, which one is more acidic?
Answer and explanation
Correct answer: The solution with pH 2
On the pH scale, acidity increases as the pH value decreases. Since 2 is lower than 5, the pH 2 solution is more acidic. In terms of hydrogen-ion concentration, a one-unit pH difference represents a tenfold difference; therefore pH 2 has a much greater hydrogen-ion concentration than pH 5. Thus option A is correct, not B, C, or D.
Frequently asked questions
What is the correct answer to this question?
The solution with pH 2
Why is this the correct answer?
On the pH scale, acidity increases as the pH value decreases. Since 2 is lower than 5, the pH 2 solution is more acidic. In terms of hydrogen-ion concentration, a one-unit pH difference represents a tenfold difference; therefore pH 2 has a much greater hydrogen-ion concentration than pH 5. Thus option A is correct, not B, C, or D.
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.
